Psychology Behavior

Psychology — the scientific study of mind and behavior — emerged as a formal discipline with Wilhelm Wundt's experimental laboratory (Leipzig, 1879), and has evolved through behaviorism (Watson, Skinner — studying only observable behavior, rejecting mental states), cognitive psychology (mental processes), social psychology, neuroscience, and evolutionary psychology. Its most famous experiments have overturned comfortable assumptions about human nature. Milgram's obedience experiments (1961-62): 65% of ordinary American participants delivered apparently lethal electric shocks to innocent strangers when instructed to by an authority figure — demonstrating that ordinary people, under social pressure, will commit acts they would normally find unconscionable. Zimbardo's Stanford Prison Experiment (1971): students assigned guard and prisoner roles began acting abusively within days — though later criticized for methodological problems. Harlow's rhesus monkey studies (1950s): infant monkeys preferred comfort (cloth mothers) over food (wire mothers with milk), revolutionizing attachment theory and showing infant development is about emotional bonds, not nutrition. The replication crisis (2011-present) found that 50-60% of social psychology studies fail to replicate — raising fundamental questions about which psychological 'facts' are real.