Biological psychology is the branch of psychology, which includes studies of the various biological bases of behavior. These include the study of neuroanatomy and physiology, the influences of hormones and other chemicals, and the genetics and heritability of behavioral traits. Biological psychology is one of a group of brain sciences called the neurosciences. Neuroscientists as a group are interested in all the diverse aspects of the nervous system, while biological psychologists in particular are more specifically interested in the biology of behavior.

Eysenck was opposed to the psychoanalytic theories of Freud, claiming that that he was not empirical enough. Early research involved a factor analysis of a psychiatric population where two major factors were determined

This was the basis of his original model of personality, which consisted of two very clearly marked dimensions of human patterns of behavior.

The Humanistic approach is difficult because there are no agreed-upon definitions of what constitutes a humanistic personality theory (Burger, pg. 310).

The following four elements are central to the general viewpoint to which we apply the "humanistic" label"

Many humanistic psychologists stress the importance of social change, the challenge of modifying old institutions and inventing new ones able to sustain both human development and organizational efficacy. Thus the humanistic emphasis on individual freedom should be matched by a recognition of our interdependence and our responsibilities to one another, to society and culture, and to the future.

Some common words found in the essay are:
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