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Dunbar's number is a theoretical cognitive limit to the number of people with whom one can maintain stable social relationships. These are relationships in which an individual knows who each person is, and how each person relates to every other person. Proponents assert that numbers larger than this generally require more restrictive rules, laws, and enforced norms to maintain a stable, cohesive group. No precise value has been...
 number psychology brain neuroscience social network group sociology network statistics limit
Our ability to project a picture of ourselves in other people's minds may be down to a distinct form of brain activity, according to a report.
 brain neuroscience deception psychology toread
Endorphins ("endogenous morphine") are endogenous opioid peptides that function as neurotransmitters. They are produced by the pituitary gland and the hypothalamus in vertebrates during exercise, excitement, pain, consumption of spicy food, love and orgasm, and they resemble the opiates in their abilities to produce analgesia and a feeling of well-being.
 endorphin neuroscience brain exercise orgasm running hypothalamus happiness endurance pregnancy achievement challenge satisfaction Wikipedia
Your brain doesn't like to keep secrets. Studies at the University of Texas, Austin, have shown that writing down secrets in a journal or telling a doctor your secrets actually decreases the level of stress hormones in your body. Keeping a secret, meanwhile, does the opposite.


 unconscious brain psychology neuroscience secret consciousness memory writing
Bats and dolphins bounce sound waves off their surroundings and by listening to the echoes can "see" the world around them. Some blind humans have also trained themselves to do this, allowing them to explore cities, cycle and play sports.


 navigation blind bat echolocation brain sight hearing human neuroscience vision
As we are social animals, more influenced by context and less by conscious choice than we assume, there is simple advice to anyone who wants to be a more virtuous person. Don't read self-help books, there is no evidence they work. Just choose more virtuous friends, and pretty soon you are likely to start copying them.


 neuroscience politics psychology social network manipulation philosophy
Cognitive-enhancing drugs are normally prescribed to treat medical conditions such as Alzheimer's disease, but some people are now using them to try to improve their memory and help them study, often without knowing the medical risks.


 cognition memory Alzheimer's drug brain neuroscience