In the Questions on _g_ and intelligence thread we have been discussing one branch of psychology (psychometrics), and one branch within that sub-discipline (intelligence). In that thread, Mandrake quoted Jensen: This got me wondering, what is the status of all other psychological variables, wrt genetics? In particular, since psychometrics is much broader than just intelligence - it includes, for example, personality, aptitudes, interests, achievement, and proficiency - how far have psychologists got in terms of showing genetic bases for these (presumably) quantitatively characterised aspects? Psychology is, of course, concerned with brains, albeit indirectly. With the recent advances in neuroscience, one might expect that the 'brain biology' basis for findings in psychology could be elucidated. Indeed, as this comment by Mandrake - wrt intelligence and _g_ - makes clear, intelligence psychometricians believe they have made just such connections: How widely are such brain models used by psychometricians studying, for example, personality? What different brain models do other psychologists use? How do these various models relate to what neuroscientists have found?