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Testosterone has a lot of roles--some good, some perhaps counterproductive. Now research suggests that testosterone can make people more poised for aggression, even if they’re not feeling feisty. [More]

Mood disorders such as depression are known to increase drug abuse risk. Yet mounting evidence suggests that substance abuse also makes people more vulnerable to depression and the negative effects of stress, according to Eric J. Nestler, chair of neuroscience at the Mount Sinai School of Medicine

Sleep deprivation can lead to plenty of unwise decisions, which researchers have long tied to flagging attention and short-term memory . But a new study shows how just one night of missed sleep can make people more likely to chase big gains while risking even larger losses--independent of their tapering attention spans. [More]