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johnsonel7

Sensory perception | Science Features | Naked Scientists - 0 views

www.thenakedscientists.com/...derstanding-sensory-perception

sense perception brain science

shared by johnsonel7 on 01 Nov 19 - No Cached
  • Deciphering how the brain processes sight and hearing could have implications for how we understand and treat conditions such as dyslexia, autism and schizophrenia.
  • schizophrenia
  • Through a project called SENSOCOM, she is exploring how sensory perception affects communication, focusing on the brain’s deep subcortical structures.By doing this, she and her team are exploring a part of the brain traditionally excluded by research trying to understand communication impairments found in autism spectrum disorder and dyslexia, conditions which affect around 53 million people in Europe.
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  • To do this they have been focusing on the sensory pathways linked to these deep structures. She and her group discovered that adults with dyslexia have weaker pathway connections between a visual subcortical structure (the left visual thalamus) with an area of the cortex called V5/MT, which is critical for the perception of visual motion. In the auditory mode, there was a similar finding. The team discovered weaker connections between the left auditory thalamus and a cortex structure linked to auditory motion, which is important for speech perception. These connections could therefore be important for reading and for predicting reading skill, according to Dr von Kriegstein.
  • So how might this translate into helping people with dyslexia? This is basic science, says Prof. von Kriegstein, so first it’s crucial to understand the mechanisms behind communications disorders before developing therapy training tools, although she is optimistic these could lie within reach.
  • The way the brain encodes information and in turn directs perception of that sensory experience is a highly variable process.
  • The sensory overload or distorted and heightened perceptions described by schizophrenia patients, for instance, could relate to these deficits. Sensory dysfunction has also been linked to delusions and hallucinations as well as difficulties with attention and reading the emotions or tone of others – all of which can affect social interaction.
  • According to Dr Fellin, decreased connectivity between nerve cells (neurons) appears to play an important role in the progression of schizophrenia. So far, Dr Fellin and his group have identified which specific neurons influence sensory responses in mouse studies, but not yet in animal models of schizophrenia, with similar investigations in glial cells  - the supporting cells of the nervous system.
katedriscoll

Sensory Perception - An Introduction to the Process of Perception - 0 views

byjus.com/...sensory-perception

shared by katedriscoll on 15 Jan 21 - No Cached
  • An individual or organism capable of processing the stimuli in their environment is called to have a sensory perception.
  • This processing is done through the coordination between sense organs and the brain. Hearing, vision, taste, smell, and touch are the five senses we possess. The sensory perception involves detecting, recognizing, characterizing and responding to stimuli.
  • The process of sensory perception begins when something in the real world stimulates our sense organs. For instance, light reflecting from a surface stimulates our eyes. The warmth emanating from a hot cup of beverage stimulates our touch senses.
carolinewren

Pain Really Is All In Your Head And Emotion Controls Intensity | WFSU - 0 views

news.wfsu.org/...ead-emotion-controls-intensity

pain science

shared by carolinewren on 09 Mar 15 - No Cached
  • When you whack yourself with a hammer, it feels like the pain is in your thumb. But really it's in your brain.
  • perception of pain is shaped by brain circuits that are constantly filtering the information coming from our sensory nerves,
  • In 2003, Turner was unloading supplies when his unit came under attack. He was wounded by a grenade. "He took shrapnel in his leg, in his side — and he didn't even notice that he had been hit,"
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  • Despite his injuries, Turner began giving first aid and pulled other soldiers to safety. As he worked, he was shot twice — one bullet breaking a bone in his arm. Yet Turner would say later that he felt almost no pain.
  • "Soldiers in the heat of the moment don't recognize the pain that's happening," Linden says. But once that moment is over, those same soldiers may feel a lot of pain from something minor, like a hypodermic needle, he says.
  • CIA interrogators used both tactics after Sept. 11, according to a Senate report released late last year.
  • One system determines the pain's location, intensity and characteristics: stabbing, aching, burning, etc.
  • there is a completely separate system for the emotional aspect of pain
  • positive emotions — like feeling calm and safe and connected to others — can minimize pain. But negative emotions tend to have the opposite effect. Torturers have exploited that aspect for centuries.
  • they want to accentuate pain during torture they can do this with humiliation [or] with an unpredictable schedule of delivering pain
  • Those things will make the emotional component of the pain experience stronger."
  • brain also determines the emotion we attach to each painful experience, Linden says. That's possible, he explains, because the brain uses two different systems to process pain information coming from our nerve endings.
  • One thing scientists are still trying to understand is precisely how the brain regulates the perception of pain
  • The team studied low-frequency brain waves in a part of the brain that responds to sensations in the hand,
  • Earlier research had shown that these rhythms increase when the brain is blocking sensory information from the hand.
  • reseasrchers monitored the brain waves of a dozen people who were asked to pay attention only to their hand or only to their foot. During the experiment the scientists delivered a light tap to each person's finger or toe.
  • ocused on their feet, low-frequency rhythms increased in the brain area that responds to hand sensations — because participants were asking their brains to ignore sensory input from the hand, and it's these low-frequency rhythms that do the blocking of such information.
  • low-frequency rhythms also increased in a different brain area — the region that ignores distractions, the team discovered.
  • The two areas became synchronized
  • "There's coordination between the front part of the brain, which is the executive control region of the brain, and the sensory part of the brain, which is filtering information from the environment," she says.
  • suggests that at least some people can teach their brains how to filter out things like chronic pain, perhaps through meditation
  • It found that people who practiced mindfulness meditation for eight weeks greatly improved their control of the brain rhythms that block out pain.
katedriscoll

Phantom limb pain: A literature review - 0 views

www.ncbi.nlm.nih.gov/...PMC6354174

shared by katedriscoll on 03 Nov 20 - No Cached
  • . The purpose of this review article is to summarize recent researches focusing on phantom limb in order to discuss its definition, mechanisms, and treatments.
  • The incidence of phantom limb pain has varied from 2% in earlier records to higher rates today. Initially, patients were less likely to mention pain symptoms than today which is a potential explanation for the discrepancy in incidence rates. However, Sherman et al.4 discuss that only 17% phantom limb complaints were initiated treated by physicians. Consequently, it is important to determine what constitutes phantom pain in order to provide efficacious care. Phantom pain is pain sensation to a limb, organ or other tissue after amputation and/or nerve injury.5 In podiatry, the predominant cause of phantom limb pain is after limb amputation due to diseased state presenting with an unsalvageable limb. Postoperative pain sensations from stump neuroma pain, prosthesis, fibrosis, and residual local tissue inflammation can be similar to phantom limb pain (PLP). Patients with PLP complain of various sensations including burning, stinging, aching, and piercing pain with changing warmth and cold sensation to the amputated area which waxes and wanes.6 Onset of symptoms may be elicited by environmental, emotional, or physical changes.
  • The human body encompasses various neurologic mechanisms allowing reception, transport, recognition, and response to numerous stimuli. Pain, temperature, crude touch, and pressure sensory information are carried to the central nervous system via the anterolateral system, with pain & temperature information transfer via lateral spinothalamic tracts to the parietal lobe. In detail, pain sensation from the lower extremity is transported from a peripheral receptor to a first degree pseudounipolar neurons in the dorsal root ganglion and decussate and ascend to the third-degree neurons within the thalamus.7 This sensory information will finally arrive at the primary sensory cortex in the postcentral gyrus of the parietal lobe which houses the sensory homunculus.8 It is unsurprising that with an amputation that such an intricate highway of information transport to and from the periphery may have the potential for problematic neurologic developments.
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  • How does pain sensation, a protection mechanism for the human body, become chronic and unrelenting after limb loss? This is a question researchers still ask today with no concise conclusion. Phantom limb pain occurs more frequently in patients who also experience longer periods of stump pain and is more likely to subside as the stump pain subsides.9 Researchers have also found dorsal root ganglion cells change after a nerve is completely cut. The dorsal root ganglion cells become more active and sensitive to chemical and mechanical changes with potential for plasticity development at the dorsal horn and other areas.10 At the molecular level, increasing glutamate and NMDA (N-methyl d-aspartate) concentrations correlate to increased sensitivity which contributes to allodynia and hyperalgesia.11 Flor et al.12 further described the significance of maladaptive plasticity and the development of memory for pain and phantom limb pain. They correlated it to the loss of GABAergic inhibition and the development of glutamate induced long-term potentiation changes and structural changes like myelination and axonal sprouting.
  • Phantom limb pain in some patients may gradually disappear over the course of a few months to one year if not treated, but some patients suffer from phantom limb pain for decades. Treatments include pharmacotherapy, adjuvant therapy, and surgical intervention. There are a variety of medications to choose from, which includes tricyclic antidepressants, opioids, and NSAIDs, etc. Among these medications, Tricyclic antidepressant is one of the most common treatments. Studies have shown that Amitriptyline (a tricyclic antidepressant) has a good effect on relieving neuropathic pain.25
  • Phantom limb pain is very common in amputees. As a worldwide issue, it has been studied by a lot of researchers. Although phantom limb sensation has already been described and proposed by French military surgeon Ambroise Pare 500 years ago, there is still no detailed explanation of its mechanisms. Therefore, more research will be needed on the different types of mechanisms of phantom limb pain. Once researchers and physicians are able to identify the mechanism of phantom limb pain, mechanism-based treatment will be rapidly developed. As a result, more patients will be benefit from it in the long run.
  • katedriscoll on 03 Nov 20
     
    One of the articles we read mentioned phantom limbs. This article goes more indepth on what a phantom limb is, why it happens and some cures.
Blair Peterson

Hearing Through Your Skin, and Other Adventures in Sensory Substitution | In Their Own ... - 0 views

bigthink.com/...dventures-sensory-substitution

sensory brain science senses technology research hearing

shared by Blair Peterson on 05 May 13 - No Cached
  • What's very interesting, I think, as we keep pushing forward with technology, is we’ll be able to take more and more data from those invisible parts of the world and start feeding them into our brain.  
kirkpatrickry

Wiretapping the senses: Scientists monitor conversation between sensory perception, beh... - 0 views

www.sciencedaily.com/...160602132636.htm

senses perception

shared by kirkpatrickry on 03 Jun 16 - No Cached
  • Many types of sensory information enter the brain at a structure called the primary sensory cortex, where they are processed by different layers of cells in ways that ultimately influence an animal's perception and behavioral response.
  • An ultimate goal of neurobiological research is to understand how a brain integrates a constant flow of various types of stimuli, makes sense of it, and helps coordinate an appropriate behavioral respons
  • Understanding the most basic principles of this system will require careful studies of regions of animal brains that are simple enough to keep track of nerve impulses as they enter, and yet complex enough to follow different types of signals as they exit along different routes.
Javier E

How Did Consciousness Evolve? - The Atlantic - 0 views

www.theatlantic.com/...485558

Evolution Consciousness psychology brain science

shared by Javier E on 09 Jun 16 - No Cached
  • Theories of consciousness come from religion, from philosophy, from cognitive science, but not so much from evolutionary biology. Maybe that’s why so few theories have been able to tackle basic questions such as: What is the adaptive value of consciousness? When did it evolve and what animals have it?
  • The Attention Schema Theory (AST), developed over the past five years, may be able to answer those questions.
  • The theory suggests that consciousness arises as a solution to one of the most fundamental problems facing any nervous system: Too much information constantly flows in to be fully processed. The brain evolved increasingly sophisticated mechanisms for deeply processing a few select signals at the expense of others, and in the AST, consciousness is the ultimate result of that evolutionary sequence
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  • Even before the evolution of a central brain, nervous systems took advantage of a simple computing trick: competition.
  • It coordinates something called overt attention – aiming the satellite dishes of the eyes, ears, and nose toward anything important.
  • Selective enhancement therefore probably evolved sometime between hydras and arthropods—between about 700 and 600 million years ago, close to the beginning of complex, multicellular life
  • The next evolutionary advance was a centralized controller for attention that could coordinate among all senses. In many animals, that central controller is a brain area called the tectum
  • At any moment only a few neurons win that intense competition, their signals rising up above the noise and impacting the animal’s behavior. This process is called selective signal enhancement, and without it, a nervous system can do almost nothing.
  • All vertebrates—fish, reptiles, birds, and mammals—have a tectum. Even lampreys have one, and they appeared so early in evolution that they don’t even have a lower jaw. But as far as anyone knows, the tectum is absent from all invertebrates
  • According to fossil and genetic evidence, vertebrates evolved around 520 million years ago. The tectum and the central control of attention probably evolved around then, during the so-called Cambrian Explosion when vertebrates were tiny wriggling creatures competing with a vast range of invertebrates in the sea.
  • The tectum is a beautiful piece of engineering. To control the head and the eyes efficiently, it constructs something called an internal model, a feature well known to engineers. An internal model is a simulation that keeps track of whatever is being controlled and allows for predictions and planning.
  • The tectum’s internal model is a set of information encoded in the complex pattern of activity of the neurons. That information simulates the current state of the eyes, head, and other major body parts, making predictions about how these body parts will move next and about the consequences of their movement
  • In fish and amphibians, the tectum is the pinnacle of sophistication and the largest part of the brain. A frog has a pretty good simulation of itself.
  • With the evolution of reptiles around 350 to 300 million years ago, a new brain structure began to emerge – the wulst. Birds inherited a wulst from their reptile ancestors. Mammals did too, but our version is usually called the cerebral cortex and has expanded enormously
  • The cortex also takes in sensory signals and coordinates movement, but it has a more flexible repertoire. Depending on context, you might look toward, look away, make a sound, do a dance, or simply store the sensory event in memory in case the information is useful for the future.
  • The most important difference between the cortex and the tectum may be the kind of attention they control. The tectum is the master of overt attention—pointing the sensory apparatus toward anything important. The cortex ups the ante with something called covert attention. You don’t need to look directly at something to covertly attend to it. Even if you’ve turned your back on an object, your cortex can still focus its processing resources on it
  • The cortex needs to control that virtual movement, and therefore like any efficient controller it needs an internal model. Unlike the tectum, which models concrete objects like the eyes and the head, the cortex must model something much more abstract. According to the AST, it does so by constructing an attention schema—a constantly updated set of information that describes what covert attention is doing moment-by-moment and what its consequences are
  • Covert attention isn’t intangible. It has a physical basis, but that physical basis lies in the microscopic details of neurons, synapses, and signals. The brain has no need to know those details. The attention schema is therefore strategically vague. It depicts covert attention in a physically incoherent way, as a non-physical essence
  • this, according to the theory, is the origin of consciousness. We say we have consciousness because deep in the brain, something quite primitive is computing that semi-magical self-description.
  • I’m reminded of Teddy Roosevelt’s famous quote, “Do what you can with what you have where you are.” Evolution is the master of that kind of opportunism. Fins become feet. Gill arches become jaws. And self-models become models of others. In the AST, the attention schema first evolved as a model of one’s own covert attention. But once the basic mechanism was in place, according to the theory, it was further adapted to model the attentional states of others, to allow for social prediction. Not only could the brain attribute consciousness to itself, it began to attribute consciousness to others.
  • In the AST’s evolutionary story, social cognition begins to ramp up shortly after the reptilian wulst evolved. Crocodiles may not be the most socially complex creatures on earth, but they live in large communities, care for their young, and can make loyal if somewhat dangerous pets.
  • If AST is correct, 300 million years of reptilian, avian, and mammalian evolution have allowed the self-model and the social model to evolve in tandem, each influencing the other. We understand other people by projecting ourselves onto them. But we also understand ourselves by considering the way other people might see us.
  • t the cortical networks in the human brain that allow us to attribute consciousness to others overlap extensively with the networks that construct our own sense of consciousness.
  • Language is perhaps the most recent big leap in the evolution of consciousness. Nobody knows when human language first evolved. Certainly we had it by 70 thousand years ago when people began to disperse around the world, since all dispersed groups have a sophisticated language. The relationship between language and consciousness is often debated, but we can be sure of at least this much: once we developed language, we could talk about consciousness and compare notes
  • Maybe partly because of language and culture, humans have a hair-trigger tendency to attribute consciousness to everything around us. We attribute consciousness to characters in a story, puppets and dolls, storms, rivers, empty spaces, ghosts and gods. Justin Barrett called it the Hyperactive Agency Detection Device, or HADD
  • the HADD goes way beyond detecting predators. It’s a consequence of our hyper-social nature. Evolution turned up the amplitude on our tendency to model others and now we’re supremely attuned to each other’s mind states. It gives us our adaptive edge. The inevitable side effect is the detection of false positives, or ghosts.
carolinewren

The Science of Sensory Marketing - HBR - 0 views

hbr.org/...e-science-of-sensory-marketing

sensory marketing

shared by carolinewren on 09 Mar 15 - No Cached
  • learning to deploy cues, such as the sting from a swig of mouthwash and the scritch-scratch sound of a Sharpie pen, that can intensify perceptions of brands
  • For example, people who had briefly held a warm beverage were more likely than people who had held a cold one to think that a stranger was friendly; this was demonstrated in an experiment by Lawrence E. Williams, of the University of Colorado at Boulder, and John A. Bargh, of Yale
  • And warm ambient temperatures prompted people to conform to a crow
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  • “starting to realize how powerful the responses to nonconscious stimuli can be,”
  • Such influences are subtle—and that’s exactly why they are so powerful. Consumers don’t perceive them as marketing messages and therefore don’t react with the usual resistance to ads and other promotions.
  • Consider this campaign by Dunkin’ Donuts in South Korea: When a company jingle played on municipal buses, an atomizer released a coffee aroma.
  • increased visits to Dunkin’ Donuts outlets near bus stops by 16% and sales at those outlets by 29%.
  • Bank executives should make sure that branch offices exude the reassuring, wealth-suggesting aromas of wood and leather.
  • The three found that imbuing pencils with the unusual scent of tea tree oil dramatically increased research subjects’ ability to remember the pencils’ brand and other details. Whereas those given unscented pencils experienced a 73% decline in the information they could recall two weeks later, subjects given tea-tree-scented pencils experienced a decline of only 8%.
  • “In the past, communications with customers were essentially monologues—companies just talked at consumers,”
  • Then they evolved into dialogues, with customers providing feedback. Now they’re becoming multidimensional conversations, with products finding their own voices and consumers responding viscerally and subconsciously to them.”
  • should be at the center of product innovation and marketing for many brands.
paisleyd

Study reveals how brain multitasks: Findings help explain how the brain pays attention ... - 0 views

www.sciencedaily.com/...151021135619.htm

science research brain

shared by paisleyd on 26 Oct 15 - No Cached
  • a shell-shaped region in the center of the mammalian brain, known as the thalamic reticular nucleus or TRN, is likely responsible for the ability to routinely and seamlessly multitask
  • its individual neurons as possible regulators of the brain's ability to multitask
  • blocking out distracting information from other senses
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  • a newly emerging model of how the brain focuses attention on a particular task, using neurons in the thalamic reticular nucleus as a switchboard to control the amount of information the brain receives, limiting and filtering out sensory information that we don't want to pay attention to
  • People need to be able to focus on one thing and suppress other distractions to perform everyday functions such as driving, talking on the phone, and socializing
  • sets the stage for ever more detailed studies on the complex behavior involved in how the mammalian brain pays attention to what's important, and especially how those neural circuits are broken in cases of attention-deficit diseases, such as ADHD, autism, and schizophrenia
  • ndividual TRN neurons that act like a "switchboard," continuously filtering sensory information and shifting more or less attention onto one sense
  • The test, they say, was designed to gauge how well the area of the brain known to control higher behavioral functions, the prefrontal cortex, could direct the focus on one sense over another
  • researchers distracted the mice with opposing stimuli: If the mouse was expecting a flash of light to guide it to the milk reward, the researchers distracted it with a sound, and vice versa. Distracting the mice decreased their ability to collect the food reward to 70 percent from nearly 90 percent, even if the distracting stimulus was removed later
  • found that inactivating the prefrontal cortex region of the brain, which is believed responsible for decision-making in complex behaviors, disrupted TRN neural signaling and reduced mice to only random success in obtaining a milk reward when presented with specifically cued light or sound signals
  • Inactivating the TRN, while leaving the cortical regions intact, also diminished success with obtaining the prompted food reward
  • prefrontal cortex is essential to performing such behavioral tasks
  • this part of the brain "stores the knowledge ultimately communicated to the TRN to control how much visual or auditory sensory information is suppressed or not, and how the brain ultimately multitasks
Javier E

A New Understanding of How Movement Decreases Stress - The Atlantic - 0 views

www.theatlantic.com/...496679

stress research science psychology brain science neural nets psychosomatic

shared by Javier E on 24 Aug 16 - No Cached
  • If stress is controlled by these few cortical areas—the part of the brain that deals in high-level executive functioning, our beliefs and existential understandings of ourselves—why would any sort of body movement play a part in decreasing stress?
  • Pittsburgh neuroscientists showed that they have discovered a discrete, elaborate network in the cerebral cortex that controls the adrenal medulla. It seems that the connections between the brain and the adrenal medulla are much more elaborate than previously understood. Complex networks throughout the primary sensory and motor cortices are tied directly to our stress responses.
  • “This is suggesting a much more decentralized process,” said Bruno of the findings. He was not involved in the study.“You have lots of different circuits built on top of one another, and they’re all feeding back to one of our most primitive and primordial response systems. They've really shown that stress is controlled by more than the traditional high-level cognitive areas. I think that’s a big deal.
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  • Rabies moves at a predictable rate, replicating every eight to 10 hours, moving rapidly through chains of neurons and revealing a network. The researchers could allow the virus to move up the nervous system and reach the brain but could sacrifice the monkey before it showed any symptoms of infection.
  • When the virus has had enough time to travel a predictable distance, the researchers anesthetize the animal, wash out its blood, perfuse the central nervous system with fixatives, and use antibodies to detect where the virus has spread. The kills were timed to various stages to create a map. By the time you’ve gone through several sets of synapses that mapping is an enormous task. There’s an exponential increase in the number of neurons.
  • the researchers were astounded at what they saw. The motor areas in the brain connect to the adrenal glands. In the primary motor cortex of the brain, there’s a map of the human body—areas that correspond to the face, arm, and leg area, as well as a region that controls the axial body muscles (known to many people now as “the core”).
  • “Something about axial control has an impact on stress responses,” Strick reasons. “There’s all this evidence that core strengthening has an impact on stress. And when you see somebody that's depressed or stressed out, you notice changes in their posture. When you stand up straight, it has an effect on how you project yourself and how you feel.  Well, lo and behold, core muscles have an impact on stress. And I suspect that if you activate core muscles inappropriately with poor posture, that’s going to have an impact on stress.”
  • “These neural pathways might explain our intuitive sense for why there are many different strategies for coping with stress,” said Bruno. “I like the examples they give in the paper—that maybe this is why yoga and pilates are so successful. But there are lots of other things where people talk about mental imagery and all sorts of other ways that people deal with stress. I think having so many neural pathways having direct lines to the stress control system, that’s really interesting.”
  • Bruno specializes more in sensory neuroscience, so he read a more into the findings in the primary somatosensory cortex. Some of these tactile areas in the brain seem to be providing as much input to the adrenal medulla as the cortical areas. “To me that's really new and interesting,” said Bruno. “It might explain why certain sensations we find very relaxing or stressful.”
  • “It's not clear to me—from our work, and from their work—that what we call motor cortex is really motor cortex,” he said. “Maybe the primary sensory cortex is doing something more than we thought. When I see results like these, I go, hm, maybe these areas aren’t so simple.”
  • With this come implications for what’s currently known as “psychosomatic illness”—how the mind has an impact over organ functions. The name tends to have a bad connotation. The notion that this mind-body connection isn’t really real; that psychosomatic illnesses are “all in your head.” Elaborate connections like this would explain that, yes, it is all in your head. The fact that cortical areas in the brain that have multi-synaptic connections that control organ function could strip the negative connotations
  • As he put it, “How we move, think, and feel have an impact on the stress response through real neural connections.”
katedriscoll

Making Sense of the World, Several Senses at a Time - Scientific American - 0 views

www.scientificamerican.com/...se-world-sveral-senses-at-time

shared by katedriscoll on 03 Nov 20 - No Cached
  • Our five senses–sight, hearing, touch, taste and smell–seem to operate independently, as five distinct modes of perceiving the world. In reality, however, they collaborate closely to enable the mind to better understand its surroundings. We can become aware of this collaboration under special circumstances.
  • In some cases, a sense may covertly influence the one we think is dominant. When visual information clashes with that from sound, sensory crosstalk can cause what we see to alter what we hear. When one sense drops out, another can pick up the slack.
  • People with synesthesia have a particularly curious cross wiring of the senses, in which activating one sense spontaneously triggers another.
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  • During speech perception, our brain integrates information from our ears with that from our eyes. Because this integration happens early in the perceptual process, visual cues influence what we think we are hearing. That is, what we see can actually shape what we "hear."
  • When visual information clashes with that from sound, sensory crosstalk can cause what we see to alter what we hear
  • Perceptual systems, particularly smell, connect with memory and emotion centers to enable sensory cues to trigger feelings and recollections, and to be incorporated within them
  • What might life be like if you had synesthesia? Here is one artist's rendition of the experience of a synaesthete. In this surreal world, music records smell like different colors, foods tastes like specific noises, and sound comes in all varieties of textures and shapes
  • katedriscoll on 03 Nov 20
     
    This article describes how our senses work together and we piece together the small amounts of information we take in to create an image.
runlai_jiang

What Is Synesthesia? Definition and Types - 0 views

www.thoughtco.com/a-definition-and-types-4153376

shared by runlai_jiang on 15 Jan 18 - No Cached
  • The term "synesthesia" comes from the Greek words syn, which means "together", and aisthesis, which means "sensation." Synesthesia is a perception in which stimulating one sensory or cognitive pathway  causes experiences in another sense or cognitive pathway. In other words, a sense or concept is connected to a different sense or concept, such as hearing a color or tasting a word. The connection between pathways is involuntary and consistent over time, rather than conscious or arbitrary.
  • Types of SynesthesiaThere are many different types of synesthesia, but they may be categorized as falling into one of two groups: associative synesthesia and projective synesthesia. An associate feels a connection between a stimulus and a sense, w
  • There are at least 80 known types of synesthesia, but some are more common than others: Chromesthesia: In this common form of synesthesia, sounds and colors are associated with each other. For example, the musical note "D" may correspond to seeing the color green.Grapheme-color synesthesia: This is a common form of synesthesia characterized by seeing graphemes (letter or numerals) shaded with a color. Synesthetes don't associate the same colors for a grapheme as each other, although the letter "A" does appear to be red to many individuals. Persons who experience grapheme-color synesthesia sometimes report seeing impossible colors when red and green or blue and yellow graphemes appear next to each other in a word or number. Number form: A number form is a mental shape or map of numbers resulting from seeing or thinking about numbers.Lexical-gustatory synesthesia: This a rare type of synesthesia in which hearing a word results in tasting a flavor. For example, a person's name might taste like chocolate.Mirror-touch synesthesia: While rare, mirror-touch synesthesia is noteworthy because it can be disruptive to a synesthete's life. In this form of synesthesia, an individual feels the same sensation in response to a stimulus as another person. For example, seeing a person being tapped on the shoulder would cause the synesthete to feel a tap on
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  • How Synesthesia WorksScientists have yet to make a definitive determination of the mechanism of synesthesia. It may be due to increased cross-talk between specialized regions of the brain. Another possible mechanism is that inhibition in a neural pathway is reduced in synesthetes, allowing multi-sensory processing of stimuli. Some researchers believe synesthesia is based on the way the brain extracts and assigns the meaning of a stimulus (ideasthesia).
  • Who Has Synesthesia?Julia Simner, a psychologist studying synesthesia at of the University of Edinburgh, estimates at least 4% of the population has synesthesia and that over 1% of people have grapheme-color synesthesia (colored numbers and letters). More women have synesthesia than men. Some research suggests the incidenc
  • Can You Develop Synesthesia?There are documented cases of non-synesthetes developing synesthesia. Specifically, head trauma, stroke, brain tumors, and temporal lobe epilepsy may produce synesthesia. Temporary synesthesia may result from exposure to the psychedelic drugs mescaline or LSD, from sensory deprivation, or from meditation.
demetriar

How Culture Shapes Our Senses - NYTimes.com - 3 views

www.nytimes.com/...culture-shapes-our-senses.html

culture senses perception reality knowledge

shared by demetriar on 08 Mar 15 - No Cached
  • social psychologist Daryl J. Bem described the knowledge we gain from our senses as “zero-order beliefs,” so taken for granted that we do not even notice them as beliefs. The sky is blue. The fan hums. Ice is cold. That’s the nature of reality, and it seems peculiar that different people with their senses intact would experience it subjectively.
  • sensory perception is culturally specific.
  • . But more and more are willing to argue that sensory perception is as much about the cultural training of attention as it is about biological capacity.
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  • That’s why we think of scent as a trigger for personal memory — leading to the recall of something specific, particular, uniquely our own.
  • When the research team visited the Jahai, rain-forest foragers on the Malay Peninsula, they found that the Jahai were succinct and more accurate with the scratch-and-sniff cards.
  • The team also found that several communities — speakers of Persian, Turkish and Zapotec — used different metaphors than English and Dutch speakers to describe pitch, or frequency: Sounds were thin or thick rather than high or low. In later work, they demonstrated that the metaphors were powerful enough to disrupt perception.
  • younger Cantonese speakers had fewer words for tastes and smells than older ones, a shift attributed to rapid socioeconomic development and Western-style schooling.
abby deardorff

Musical Training Optimizes Brain Function | Psychology Today - 0 views

www.psychologytoday.com/...ining-optimizes-brain-function

brain psychology

shared by abby deardorff on 18 Nov 13 - No Cached
  • Three Brain Benefits of Musical Training:
  • musical training can have a huge impact on the developing brain
  • systematic training actually helped improve brain areas related to music improvisation.
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  • training before the age of 7 years results in changes in white-matter connectivity that may serve as a solid scaffolding upon which ongoing experience can maintain a well-connected brain infrastructure into adulthood.
  • musical training improves the function and connectivity of different brain regions. Musical training increases brain volume and strengthens communication between brain areas. Playing an instrument changes how the brain interprets and integrates a wide range of sensory information, especially for those who start before age 7.
  • Musicians have an enhanced ability to integrate sensory information from hearing, touch, and sight.The age at which musical training begins affects brain anatomy as an adult; beginning training before the age of seven has the greatest impact.Brain circuits involved in musical improvisation are shaped by systematic training, leading to less reliance on working memory and more extensive connectivity within the brain.
grayton downing

Sensing Gene Therapy | The Scientist Magazine® - 0 views

www.the-scientist.com/?articles.view/articleNo/34778/title/Sensing-Gene-Therapy/

sensing gene therapy science research

shared by grayton downing on 24 Oct 13 - No Cached
  • but gene therapy may be coming to the rescue. Gene therapy’s success in treating  blindness disorders –many are in late stage trials—gave hope to a field deterred by early missteps. And now gene therapy researchers are expanding their gaze to focus on all manner of sensory diseases.
  • notable success in using gene therapy techniques to treat a sensory disorder came last year when otolaryngolotist
  • In olfactory dysfunction, there are few curative therapies,
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  • working on more broadly applying [the therapy] to other forms of genetic hearing loss,” he said. But in contrast to VGLUT3 mutant mice, which are missing the protein entirely, humans with missense mutations expressed a defective transporter, making it unclear whether Lustig’s strategy could translate to human VGLUT3-linked deafness.
  • Taste and smell are two of the senses that have received less attention from gene therapy researchers—but that’s changing
  • The neurons [in VGLUT3 mutant mice] are waiting for the neurotransmitter to activate them”—but no signal comes, and the mice are profoundly deaf,
  • Treating the mice intra-nasally with gene therapy vectors carrying the wildtype Ift88 gene, researchers saw significant regrowth of nasal cilia, whereas control mice given empty vectors showed no regrowth. Treated mice almost doubled in weight compared to controls.
  • So far, no scientists have designed a gene therapy to target taste buds, but at least one team is tackling an important factor in taste: saliva. If a person’s saliva production drops below 50 percent of normal, “you get tooth decay and trouble swallowing,”
  • Scientists are also developing gene therapies for disorders involving touch—or at least pain-sensing—neurons, with one drug candidate
  • Wolfe envisions that someday pain treatment could be as simple as visiting the doctor every few months for a quick skin prick “wherever it hurts”—choosing between a variety of genes to get the best effect.
charlottedonoho

Harvard neuroscientist: Meditation not only reduces stress, here's how it changes your ... - 0 views

www.washingtonpost.com/...t-literally-changes-your-brain

brain cognition meditation fight or flight

shared by charlottedonoho on 28 May 15 - No Cached
  • Sara Lazar, a neuroscientist at Massachusetts General Hospital and Harvard Medical School, was one of the first scientists to take the anecdotal claims about the benefits of meditation and mindfulness and test them in brain scans. What she found surprised her — that meditating can literally change your brain.
  • I started noticing that I was calmer. I was better able to handle more difficult situations. I was more compassionate and open hearted, and able to see things from others’ points of view. I thought, maybe it was just the placebo response. But then I did a literature search of the science, and saw evidence that meditation had been associated with decreased stress, decreased depression, anxiety, pain and insomnia, and an increased quality of life.
  • The first study looked at long term meditators vs a control group. We found long-term meditators have an increased amount of gray matter in the insula and sensory regions, the auditory and sensory cortex. Which makes sense. When you’re mindful, you’re paying attention to your breathing, to sounds, to the present moment experience, and shutting cognition down. It stands to reason your senses would be enhanced.
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  • The amygdala, the fight or flight part of the brain which is important for anxiety, fear and stress in general. That area got smaller in the group that went through the mindfulness-based stress reduction program.
  • Studies by other scientists have shown that meditation can help enhance attention and emotion regulation skills. But most were not neuroimaging studies. So now we’re hoping to bring that behavioral and neuroimaging science together.
Emilio Ergueta

Kant on Space | Issue 49 | Philosophy Now - 0 views

philosophynow.org/...Kant_on_Space

philosophy Kant space time research science

shared by Emilio Ergueta on 05 Jun 15 - No Cached
  • Pinhas Ben-Zvi thinks Kant was inconsistent in his revolutionary ideas about the nature of space and time.
  • In the first and second editions of his Critique of Pure Reason (A&B) Immanuel Kant asks: “What, then, are space and time? Are they real existences? Are they only determinations or relations of things, yet such as would belong to things even if they were not intuited?” (A23; B37). At the time when he wrote that, conflicting theories of space dominated the scientific and philosophical world.
  • Leibniz wrote that God does not need a ‘sense organ' to perceive objects. Leibniz argued that space is merely relations between objects and is not a self-subsistent reality. He rejected: “… the fancy of those who take space to be a substance, or at least an absolute being,” and added ironically that: “…real and absolute space (is) an idol of some modern Englishmen.” The ‘modern Englishmen' are of course Newton and his adherents.
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  • Kant, in the quotation with which I began this article, refers to the Newtonian concept as the ‘real existences' view, and to the Leibnizian concept as the view according to which space is: “only determinations or relations of things.”
  • Kant states that: “Space is not an empirical concept which has been derived from outer experiences.” (B/38) On the contrary: “…it is the subjective condition of sensibility, under which alone outer intuition is possible for us.” (A/26; B/42)
  • He further argues that this sensory-spatiotemporal process requires a supreme mediator that will synthesize the sensory input within our cognition so as to turn it into meaningful knowledge.
  • “The apodeictic certainty of all geometrical propositions and the possibility of their a priori construction is grounded in this a priori necessity of space.” (B/39), and: “Geometry is a science which determines the properties of space synthetically, and yet a priori,”(B/40).
julia rhodes

In the Human Brain, Size Really Isn't Everything - NYTimes.com - 0 views

www.nytimes.com/...ze-really-isnt-everything.html

brain science science research language technology knowledge human brain

shared by julia rhodes on 27 Dec 13 - No Cached
  • There are many things that make humans a unique species, but a couple stand out. One is our mind, the other our brain.
  • The human mind can carry out cognitive tasks that other animals cannot, like using language, envisioning the distant future and inferring what other people are thinking.
  • Scientists have long suspected that our big brain and powerful mind are intimately connected. Starting about three million years ago, fossils of our ancient relatives record a huge increase in brain size. Once that cranial growth was underway, our forerunners started leaving behind signs of increasingly sophisticated minds, like stone tools and cave paintings.
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  • In our smaller-brained ancestors, the researchers argue, neurons were tightly tethered in a relatively simple pattern of connections. When our ancestors’ brains expanded, those tethers ripped apart, enabling our neurons to form new circuits.
  • There are cortices for the other senses, too. The sensory cortices relay signals to another set of regions called motor cortices. The motor cortices send out commands. This circuit is good for controlling basic mammal behavior. “You experience something in the world and you respond to it,” Dr. Krienen said.
  • After mammals are born, their experiences continue to strengthen this wiring. As a mammal sees more of the world, for example, neurons in the visual cortex form more connections to the motor cortices, so that the bucket brigade moves faster and more efficiently.
  • Human brains are different. As they got bigger, their sensory and motor cortices barely expanded. Instead, it was the regions in between, known as the association cortices, that bloomed. Our association cortices are crucial for the kinds of thought that we humans excel at. Among other tasks, association cortices are crucial for making decisions, retrieving memories and reflecting on ourselves.
  • Association cortices are also unusual for their wiring. They are not connected in the relatively simple, bucket-brigade pattern found in other mammal brains. Instead, they link to one another with wild abandon. A map of association cortices looks less like an assembly line and more like the Internet, with each region linked to others near and far.
  • This new wiring may have been crucial to the evolution of the human mind. Our association cortices liberate us from the rapid responses of other mammal brains. These new brain regions can communicate without any input from the outside world, discovering new insights about our environment and ourselves.
demetriar

The Science of Emotion in Marketing: How Our Brains Decide What to Share and ... - 0 views

www.huffingtonpost.com/...e-of-emotion-in_b_5489567.html

science emotion marketing brain science behavior technology

shared by demetriar on 08 Mar 15 - No Cached
  • A new study says we're really only capable of four "basic" emotions: happy, sad, afraid/surprised, and angry/disgusted.
  • He found that an article was more likely to become viral the more positive it was.
  • the emotions of sadness and sorrow light up many of the same regions of the brain as happiness.
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  • . Later, those who produced the most oxytocin were the most likely to give money to others they couldn't see.
  • "Our results show why puppies and babies are in toilet paper commercials," Zak said. "This research suggests that advertisers use images that cause our brains to release oxytocin to build trust in a product or brand, and hence increase sales."
  • A study published in the Journal of Consumer Research demonstrated that consumers who experienced fear while watching a film felt a greater affiliation with a present brand than those who watched films evoking other emotions, like happiness, sadness or excitement.
  • The rude comments made participants dig in on their stance
  • That emotions are critical -- maybe even more than previously thought -- to marketing.
  • In an analysis of the IPA dataBANK, which contains 1,400 case studies of successful advertising campaigns, campaigns with purely emotional content performed about twice as well (31 percent versus 16 percent) as those with only rational content (and did a little better than those that mixed emotional and rational content).
  • The emotional brain processes sensory information in one fifth of the time our cognitive brain takes to assimilate the same input
  • we're not just sharing the object, but we're sharing in the emotional response it creates."
caelengrubb

Is there a universal hierarchy of human senses? -- ScienceDaily - 0 views

www.sciencedaily.com/...181105160852.htm

shared by caelengrubb on 07 Jun 21 - No Cached
  • Research at the University of York has shown that the accepted hierarchy of human senses -- sight, hearing, touch, taste and smell -- is not universally true across all cultures.
  • Study revealed that cultures which placed particular value on their specialist musical heritage were able to communicate more efficiently on describing sounds, even when non-musicians were tested. Similarly, living in a culture that produces patterned pottery made people better able to talk about shapes.
  • The findings could prove significant for a range of practices in education and other professions to help further enhance how people understand and utilise their sensory perceptions of the world
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  • Scientists have spent hundreds of years trying to understand how human sensory organs work, concluding that sight is the most important sense, followed hearing, touch, taste and smell.
  • To answer this question, an international team led by Professor Majid, conducted a large-scale experiment to investigate the ease with which people could communicate about colors, shapes, sounds, textures, tastes and smells
  • Speakers of 20 diverse languages, including three different sign languages, from across the globe were tested, ranging from hunter-gatherers to post-industrial societies
  • If the commonly accepted hierarchy of the senses were true, participants in the study should have been able to communicate about vision most easily, followed by sounds, such as loud and quiet; textures, such as smooth and rough; taste, such as sweet and sour; and smell, such as chocolate and coffee
  • "While English speakers behaved as predicted, describing sight and sound with ease, this was not the case across all cultures
  • What this study shows us is that we can't always assume that understanding certain human functions within the context of the English language provides us with a universally relevant perspective or solution
  • In a modern digital-led world, which typically engages sight and hearing, it could be worthwhile learning from other cultures in the way that taste and smell can be communicated
  • This could be particularly important for the future of some professions, such as the food industry, for example, where being able to communicate about taste and smell is essential
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