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A 2022 University of Cambridge study conducted by Sahakian, Langley, Chen, et al., and published in the journal _Neurology_, shows that that social isolation is linked to changes in brain structure and cognition - the mental process of acquiring knowledge - it even carries an increased risk of dementia in older adults. Previous research established that brain regions consistently involved in diverse social interactions are strongly linked to networks that support cognition, including the default mode network (which is active when we are not focusing on the outside world), the salience network (which helps us select what we pay attention to), the subcortical network (involved in memory, emotion and motivation) and the central executive network (which enables us to regulate our emotions). This particular study examined how social isolation affects grey matter - brain regions in the outer layer of the brain, consisting of neurons. It investigated data from nearly 500,000 people from the UK Biobank, with a mean age of 57. People were classified as socially isolated if they were living alone, had social contact less than monthly and participated in social activities less than weekly. The study also included neuroimaging (MRI) data from approximately 32,000 people. That data revealed that socially isolated people had poorer cognition, including in memory and reaction time, and lower volume of grey matter in many parts of the brain. These areas included the temporal region (which processes sounds and helps encode memory), the frontal lobe (which is involved in attention, planning and complex cognitive tasks) and the hippocampus - a key area involved in learning and memory, which is typically disrupted early in Alzheimer's disease. We also found a link between the lower grey matter volumes and specific genetic processes that are involved in Alzheimer's disease. Follow-ups with participants 12 years later showed that those who were socially isolated, but not

There are ways to reduce your risk of having a stroke - for example, you can exercise more and not smoke. But should a stroke occur, you might also be able to reduce your risk of losing brain function if you are a speaker of more than one language.

Dr. Thomas Bak, one of the study's authors, posits that language learning helps brains build "cognitive reserve": a rich network of neural connections - highways that can can still carry the busy traffic of thoughts even if a few bridges are destroyed, as via a stroke. "People with more mental activities have more interconnected brains, which are able to deal better with potential damage," Bak says. He likens language learning's effect on the brain to swimming's ability to strengthen the body. Learning a language at any stage in life provides a thorough workout, but other cognitive "exercises," such as doing puzzles or playing a musical instrument, might also benefit stroke recovery, he said. The research applies to the larger concept of neuroplasticity, in that the brain is dynamic and can adapt to new challenges when properly conditioned,

In this article, Muñoz explains the pros and cons to being bilingual. Some costs of being bilinguals are that the brain needs to do 2 things at once, and that they tend to produce fewer words. However it does promote cognitive reserve in elderly, and have more efficient monitoring systems (brain).

Researchers have found that people who speak multiple languages are twice as likely to recover their mental functions after a stroke as those who speak one language. The study gathered data from 608 stroke patients in Hyderabad, India, who were assessed, among others, on attention skills and the ability to retrieve and organise information. Bilinguals and multilinguals have better cognitive reserve - an improved ability of the brain to cope with damaging influences such as stroke or dementia - due to the mental challenge of speaking multiple languages and switching between them.

"The human knowledge base is eroding as we lose languages, exacerbated by the fact that most of them have never been written down or recorded... Each language is a unique expression of human creativity... it seems premature to begin constructing grand theories of universal grammar...If we can learn to value the intellectual diversity that is fostered by linguistic variety, we can all help to ensure its survival."

In a 2013 study, Karla Klein Murdock, a professor of psychology at Washington and Lee University, researched college-age texters. She found high-volume texters who were most stressed in their relationships were also most likely to admit to experiencing academic burnout and the lowest emotional well-being. Poorer sleep quality also seemed to plague the frequent texters. Why might heavy texting carry such a costly toll on people who are highly stressed in their relationships? A reasonable possibility that Murdock suggests has to do with the behavior and expectations of the heavy texter. Texting creates its own relational vortex. If the texts are flying fast and furious, things can easily get out of hand. Without the in-person cues that you would get if you were having a face-to-face discussion, misunderstandings and hurt feelings can quickly escalate. Texting also carries a cognitive cost, draining your attentional resources. As your inner reserve is worn down, you become exhausted and burned out. The physiological activation involved in texting erodes your sleep, and the stage is set for you to feel emotionally depleted.