Most research psychologists work in colleges or universities or are employed by private or governmental research laboratories. Research psychologists differ from one another in two principal ways: in the types of behavior they investigate and in the causal events they analyze. That is, they explain different types of behaviors, and they explain them in terms of different types of causes. For example, two psychologists might both be interested in memory, but they might attempt to explain memory in terms of different causal events—one may focus on physiological events while the other may focus on environmental events. Physiological Psychology Psychophysiology Comparative Psychology Behaviour Analysis Behaviour Genetics Cognitive Psychology Experimental Neuropsychology Developmental Psychology Social Psychology Personality Psychology Cross-Cultural Psychology Clinical Psychology