The psychology of individual differences strives to understand how and why people differ in their cognitive, emotional and behavioural functioning. These individual differences have their origin in the interaction between genes and environmental exposures. Moreover, individual differences are expressed in physiological functioning, which may have consequences for health and disease development. The current course addresses the biological processes underlying individual differences by discussing psychophysiological processes and measures related to individual differences. The course also zooms in on the genetic underpinnings of individual differences by examining principles and applications of human behavioural genetics. Students learn to assess psychophysiological parameters in experimental settings.