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Erich Feldmeier

J. Lee, Vincent Harley: The male fight-flight response: MAO-A, A result of SRY regulati... - 0 views

onlinelibrary.wiley.com/...full

biology science Health behaviour gender genetics personality excellent neurobiology

shared by Erich Feldmeier on 23 Mar 12 - No Cached
  • Erich Feldmeier on 23 Mar 12
     
    "Males and females differ in their biobehavioural response to stress, where males exhibit a heightened sympathetic response to stress compared with females. Specifically, Taylor et al. 1 propose that the classic "fight-or-flight" response to stress is adaptive for males, whilst females engage in a so-called "tend-and-befriend" response to stress. We propose that the Y-chromosome gene, SRY (sex-determining region on the Y chromosome), provides a genetic basis for the heightened sympathetic reactivity to stress and thus predominance of "fight-flight" response in males. Our idea is based on studies that demonstrate (i) the presence of SRY in brain regions and peripheral tissues abundant in catecholamines, (ii) the regulation of catecholamine synthesis and breakdown by SRY, and (iii) the role of SRY in voluntary movement and blood pressure in males"
Skeptical Debunker

Does promiscuity prevent extinction? - 0 views

www.physorg.com/news186327580.html

polyandry sex extinction science reason

shared by Skeptical Debunker on 25 Feb 10 - Cached
  • Known as 'polyandry' among scientists, the phenomenon of females having multiple mates is shared across most animal species, from insects to mammals. This study suggests that polyandry reduces the risk of populations becoming extinct because of all-female broods being born. This can sometimes occur as a result of a sex-ratio distortion (SR) chromosome, which results in all of the Y chromosome 'male' sperm being killed before fertilisation. The all-female offspring will carry the SR chromosome, which will be passed on to their sons in turn resulting in more all-female broods. Eventually there will be no males and the population will die out. For this study, the scientists worked with the fruitfly Drosophila pseudoobscura. They gave some populations the opportunity to mate naturally, meaning that the females had multiple partners. The others were restricted to having one mate each. They bred several generations of these populations, so they could see how each fared over time. Over fifteen generations, five of the twelve populations that had been monogamous became extinct as a result of males dying out. The SR chromosome was far less prevalent in the populations in which females had the opportunity to have multiple mates and none of these populations became extinct. The study shows how having multiple mates can suppress the spread of the SR chromosome, making all-female broods a rarity. This is because males that carry the SR chromosome produce only half as many sperm as normal males. When a female mates with multiple males, their sperm will compete to fertilise her eggs. The few sperm produced by males carrying the SR chromosome are out-competed by the sperm from normal males, and the SR chromosome cannot spread.
  • Skeptical Debunker on 25 Feb 10
     
    Promiscuous females may be the key to a species' survival, according to new research by the Universities of Exeter and Liverpool. Published today (25 February) in Current Biology, the study could solve the mystery of why females of most species have multiple mates, despite this being more risky for the individual.
charles stibs

Seahorse - Male Endurance - Roles Swapped!! | adidarwinian - 0 views

adidarwinian.com/e-male-endurance-roles-swapped

seahorse male endurance male get pregnant male pregnancy poems on seahorse unusual mode of reproduction

shared by charles stibs on 29 Jul 14 - No Cached
  • charles stibs on 29 Jul 14
     
    Seahorse - Male Endurance - Roles Swapped discusses the weirdest mode of reproduction in the animal kingdom, found in seahorses, along with beautiful poetry
  • charles stibs on 29 Jul 14
     
    Seahorse - Male Endurance - Roles Swapped discusses the weirdest mode of reproduction in the animal kingdom, found in seahorses, along with beautiful poetry
Walid Damouny

Studies suggest males have more personality - 0 views

www.physorg.com/news177760776.html

PhysOrg.com personality natural selection sexual selection genders sex

shared by Walid Damouny on 18 Nov 09 - Cached
  • Walid Damouny on 18 Nov 09
     
    "Males have more pronounced personalities than females across a range of species - from humans to house sparrows - according to new research. Consistent personality traits, such as aggression and daring, are also more important to females when looking for a mate than they are to males. Research from the University of Exeter draws together a range of studies to reveal the role that sexual selection plays in this disparity between males and females."
Erich Feldmeier

@biogarage #diversity Kim Hughes: The hottest guy guppies stand out in a crowd | Scienc... - 0 views

www.sciencenews.org/...st-guy-guppies-stand-out-crowd

Diversity Behaviour biology Science Lateralthinking innovation Evolution

shared by Erich Feldmeier on 13 Nov 13 - No Cached
  • Erich Feldmeier on 13 Nov 13
     
    "Evolution likes to keep what works best. The rest falls by the wayside. In theory, this means that the most "fit" variations, say, a color that looks poisonous or one particularly attractive to the ladies, would become the most common. By this logic, the many colors of the guppy should have conformed to a single common pattern long ago. But they haven't. Instead, the male guppies continue to show not only bright colors but also a high diversity of colors. What keeps the variety going? The rare-male effect. Female guppies prefer the males that are rare, no matter what their color pattern actually is. This effect has been documented in the laboratory in guppies and in other species like fruit flies."
Charles Daney

Mystery of Bird Maleness Partly Solved - 0 views

www.thetech.org/...news.php

sex

shared by Charles Daney on 03 Oct 09 - Cached
  • Charles Daney on 03 Oct 09
     
    In a recent study, researchers show that a gene called DMRT1 found only on the Z chromosome partly explains bird "maleness". When a ZZ embryo gets less DMRT1, the embryos start to take on some female traits. These studies show us that bird gender can be partly explained by genetics. Not having enough of a single gene can keep a bird from becoming a bona fide male bird. But this doesn't rule out the possibility of a female gene being on the W chromosome. Scientists just haven't yet found one.
kader0110

Males are threatened with extinction after this scientific discovery - scientific research - 0 views

www.scientificresarch1.tk/...hreatened-with-extinction.html

Males scientific discovery - research

shared by kader0110 on 12 May 17 - No Cached
  • kader0110 on 12 May 17
     
    Males are threatened with extinction after this scientific discovery - scientific research
Ivan Pavlov

Is there an ape for that? Orangutans plan trips - Salon.com - 0 views

www.salon.com/...singleton

science biology

shared by Ivan Pavlov on 13 Sep 13 - No Cached
  • Ivan Pavlov on 13 Sep 13
     
    What he and his orangutan buddies do in the forests of Sumatra tells scientists that advance trip planning and social networking aren't just human traits, A new study of 15 wild male orangutans finds that they routinely plot out their next day treks and share their plans in long calls, so females can come by or track them, and competitive males can steer clear.
thinkahol *

Scientists invent first male contraceptive pill - Telegraph - 0 views

www.telegraph.co.uk/...t-male-contraceptive-pill.html

science

shared by thinkahol * on 29 Jun 10 - Cached
  • thinkahol * on 29 Jun 10
     
    Scientists have developed the worlds male alternative to the female contraceptive pill.
thinkahol *

Face Research Lab » Abstracts - 0 views

www.facelab.org/...abstracts

health mate preference

shared by thinkahol * on 26 May 10 - Cached
  • thinkahol * on 26 May 10
     
    Recent formulations of sexual selection theory emphasise how mate choice can be affected by environmental factors, such as predation risk and resource quality. Women vary greatly in the extent to which they prefer male masculinity and this variation is hypothesised to reflect differences in how women resolve the trade-off between the costs (e.g., low investment) and benefits (e.g., healthy offspring) associated with choosing a masculine partner. A strong prediction of this trade-off theory is that women's masculinity preferences will be stronger in cultures where poor health is particularly harmful to survival. We investigated the relationship between women's preferences for male facial masculinity and a health index derived from World Health Organization statistics for mortality rates, life expectancies, and the impact of communicable disease. Across 30 countries, masculinity preference increased as health decreased. This relationship was independent of cross-cultural differences in wealth or women's mating strategies. These findings show non-arbitrary cross-cultural differences in facial attractiveness judgments and demonstrate the utility of trade-off theory for investigating cross-cultural variation in women's mate preferences.
thinkahol *

BPA-exposed male deer mice are demasculinized and undesirable to females, new study finds - 1 views

www.sciencedaily.com/...110627151712.htm

BPA-exposed male deer mice are demasculinized and undesirable to females new study finds

shared by thinkahol * on 01 Jul 11 - No Cached
  • thinkahol * on 01 Jul 11
     
    ScienceDaily (June 27, 2011) - While the U.S. Food and Drug Administration notes "some concern" with the controversial chemical BPA, and many other countries, such as Japan and Canada, have considered BPA product bans, disagreement exists amongst scientists in this field on the effects of BPA in animals and humans. The latest research from the University of Missouri shows that BPA causes male deer mice to become demasculinized and behave more like females in their spatial navigational abilities, leading scientists to conclude that exposure to BPA during human development could be damaging to behavioral and cognitive traits that are unique to each sex and important in reproduction.
anonymous

Learn More About Dairy Farming - 1 views

There is so much about dairy farming that is not known by the common public. With the majority of people going back to organic farming and natural products, this kind of dairy products has a lot of...

organic farming dairy Mahendra The Effect science research trivedi

started by anonymous on 22 Dec 14 no follow-up yet
Erich Feldmeier

Antibiotic for better decisions for male businessmen | SayPeople - 0 views

saypeople.com/...decisions-for-male-businessmen

evolution behaviour neurobiology gender biology science

shared by Erich Feldmeier on 29 Apr 13 - No Cached
  • Erich Feldmeier on 29 Apr 13
     
    "Watabe, M., Kato, T., Tsuboi, S., Ishikawa, K., Hashiya, K., Monji, A., Utsumi, H., & Kanba, S. (2013). Minocycline, a microglial inhibitor, reduces 'honey trap' risk in human economic exchange Scientific Reports, 3 DOI: 10.1038/srep01685"
Erich Feldmeier

The good, the bad, and the ugly: an fMRI invest... [Soc Neurosci. 2006] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...18633772

neurobiology biology excellent behaviour science social genetics evolution

shared by Erich Feldmeier on 09 Aug 12 - No Cached
  • Erich Feldmeier on 09 Aug 12
     
    "Social interactions require fast and efficient person perception, which is best achieved through the process of categorization. However, this process can produce pernicious outcomes, particularly in the case of stigma. This study used fMRI to investigate the neural correlates involved in forming both explicit ("Do you like or dislike this person?") and implicit ("Is this a male or female?") judgments of people possessing well-established stigmatized conditions (obesity, facial piercings, transsexuality, and unattractiveness), as well as normal controls. Participants also made post-scan disgust ratings on all the faces that they viewed during imaging. These ratings were subsequently examined (modeled linearly) in a parametric analysis. Regions of interest that emerged include areas previously demonstrated to respond to aversive and disgust-inducing material (amygdala and insula), as well as regions strongly associated with inhibition and control (anterior cingulate and lateral prefrontal cortex). Further, greater differences in activation were observed in the implicit condition for both the amygdala and prefrontal cortical regions in response to the most negatively perceived faces. Specifically, as subcortical responses (e.g., amygdala) increased, cortical responses (e.g., lateral PFC and anterior cingulate) also increased, indicating the possibility of inhibitory processing. These findings help elucidate the neural underpinnings of stigma"
Erich Feldmeier

"Die Gier ist älter als der Kapitalismus" - Wirtschaft - Süddeutsche.de - 0 views

www.sueddeutsche.de/...als-der-kapitalismus-1.2547695

economy gametheory groupthink organization evolution evolutionsmanagement behaviour biology science excellent

shared by Erich Feldmeier on 09 Jul 15 - No Cached
  • Erich Feldmeier on 09 Jul 15
     
    "Ist Gier eine natürliche Anlage in uns? Ja, sie ist von Mensch zu Mensch allerdings unterschiedlich ausgeprägt und die Folgen sind verschieden. Wenn einer im Supermarkt ein Riesentheater macht, um ein Schnäppchen zu ergattern, dann ist er gierig, aber er schadet damit niemandem. Wenn ein Fondsmanager gierig ist, kann das enorme Konsequenzen haben. Psychologisch gesehen ist da kein Unterschied. Beide Male geht es darum, den persönlichen Nutzen zu maximieren. Das ist eine Grundeigenschaft des Menschen."
Walid Damouny

Acting selfish? Blame your mother - 0 views

www.physorg.com/news202655329.html

PhysOrg.com selfishness genes genetics neuroscience evolution personality

shared by Walid Damouny on 04 Sep 10 - Cached
  • Walid Damouny on 04 Sep 10
     
    (PhysOrg.com) -- The fact that our female ancestors dispersed more than our male ancestors can lead to conflicts within the brain that influence our social behaviour, new research reveals.
Skeptical Debunker

Flightless mosquitoes developed to help control dengue fever - 0 views

www.physorg.com/news186076055.html

flightless mosquito breed dengue fever solution

shared by Skeptical Debunker on 22 Feb 10 - Cached
  • Dengue fever causes severe flulike symptoms and is among the world's most pressing public health issues. There are 50 million to 100 million cases per year, and nearly 40 percent of the global population is at risk. The dengue virus is spread through the bite of infected female Aedes aegypti mosquitoes, and there is no vaccine or treatment. UCI researchers and colleagues from Oxitec Ltd. and the University of Oxford created the new breed. Flightless females are expected to die quickly in the wild, curtailing the number of mosquitoes and reducing - or even eliminating - dengue transmission. Males of the strain can fly but do not bite or convey disease. When genetically altered male mosquitoes mate with wild females and pass on their genes, females of the next generation are unable to fly. Scientists estimate that if released, the new breed could sustainably suppress the native mosquito population in six to nine months. The approach offers a safe, efficient alternative to harmful insecticides.
  • Skeptical Debunker on 22 Feb 10
     
    A new strain of mosquitoes in which females cannot fly may help curb the transmission of dengue fever, according to UC Irvine and British scientists. Great idea or frankensketter?
thinkahol *

Nuclear radiation affects sex of babies, study suggests - 0 views

www.sciencedaily.com/...110526091308.htm

Nuclear radiation affects sex of babies study suggests

shared by thinkahol * on 29 May 11 - No Cached
  • thinkahol * on 29 May 11
     
    ScienceDaily (May 27, 2011) - Ionizing radiation is not without danger to human populations. Indeed, exposure to nuclear radiation leads to an increase in male births relative to female births, according to a new study by Hagen Scherb and Kristina Voigt from the Helmholtz Zentrum München.
thinkahol *

The Loneliest Plant In The World : Krulwich Wonders… : NPR - 1 views

www.npr.org/...e-loneliest-plant-in-the-world

The Loneliest Plant In World : Krulwich Wonders… NPR

shared by thinkahol * on 11 May 11 - No Cached
  • thinkahol * on 11 May 11
     
    When a cycad is ready to reproduce, it grows a large colorful cone, rich with pollen or seed. It signals its readiness by radiating heat or sending out attractive odors to pollinators, who travel back and forth. Once fertilized, the seed-rich cone is ripped apart by hungry seed carriers (who've included over the years, not just birds and insects, but dinosaurs, pterosaurs, bats; these trees have been eaten by just about everybody). But what if you can't find a mate? The tree in London (and its clones that are now growing in botanical gardens all over the world) is a male. It can make pollen. But it can't make the seeds. That requires a female. Researchers have wandered the Ngoya forest and other woods of Africa, looking for an E. woodii that could pair with the one in London. They haven't found a single other specimen. They're still searching. Unless a female exists somewhere, E. woodii will never mate with one of its own. It can be cloned. It can have the occasional fling with a closely related species. Hybrid cycads are sold at plant stores, but those plants aren't the real deal. The tree that sits in London can't produce a true offspring. It sits there, the last in its long line, waiting for a companion that may no longer exist.
thinkahol *

5 Things That Internet Porn Reveals About Our Brains | Sex & the Brain | DISCOVER Magazine - 1 views

discovermagazine.com/...article_view

5 Things That Internet Porn Reveals About Our Brains | Sex & the Brain DISCOVER Magazine

shared by thinkahol * on 21 Sep 11 - No Cached
  • thinkahol * on 21 Sep 11
     
    With its expansive range and unprecedented potential for anonymity, (the Internet gives voice to our deepest urges and most uninhibited thoughts. Inspired by the wealth of unfettered expression available online, neuroscientists Ogi Ogas and Sai Gaddam, who met as Ph.D. candidates at Boston University, began plumbing a few chosen search engines (including Dogpile and AOL) to create the world's largest experiment in sexuality in 2009. Quietly tapping into a billion Web searches, they explored the private activities of more than 100 million men and women around the world. The result is the first large-scale scientific examination of human sexuality in more than half a century, since biologist Alfred Kinsey famously interviewed more than 18,000 middle-class Caucasians about their sexual behavior and published the Kinsey reports in 1948 and 1953. Building on the work of Kinsey, neuroscientists have long made the case that male and female sexuality exist on different planes. But like Kinsey himself, they have been hampered by the dubious reliability of self-reports of sexual behavior and preferences as well as by small sample sizes. That is where the Internet comes in. By accessing raw data from Web searches and employing the help of Alexa-a company that measures Web traffic and publishes a list of the million most popular sites in the world-Ogas and Gaddam shine a light on hidden desire, a quirky realm of lust, fetish, and kink that, like the far side of the moon, has barely been glimpsed. Here is a sampling of their fascinating results, selected from their book, A Billion Wicked Thoughts.
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