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 m

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

· Adaptive value of traits explained in evolutionary terms.

Some common words found in the essay are:
Hans Eysenck's, Psychology Humanistic, Emphasis Focus, humanistic psychology, biological psychology, aroused cortex, eysenck claimed, biological factors, model personality, value orientation, eysenck claims,
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