[armoredkitten]

My best understanding (which, it's been a while since I took classes about it) is that there are some functions that tend to be more lateralized to one hemisphere or another -- with language being the prime example. However, some people do show more balanced functioning, and in some cases (more frequently among left-handed people) the lateralized functions can even be flipped from "normal".

However, there's left-brain/right-brain in terms of "some functions of the brain tend to be more on one side or another", and then there's left-brain/right-brain in terms of a pseudoscientific personality test about whether you're more of a "logical" thinker or "artistic" thinker, blah blah blah. There's no evidence for that. It's just mumbo-jumbo Buzzfeed-style quizzes to make you feel good about yourself.

[bregma]

More accurately, in right-handed populations subjects there is good correlation between localized brain insults and specific functional deficits. The association between brain insult locations and specific functional deficits is less strongly correlated in left-handed people and certain other subpopulations. These are also very much tendencies and not predictors for individuals.

[ianhanschen]

aha, thanks!