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Hans Eysenck’s description of personality has been an influential model in personality research for several decades. Hans believed that biological factors played a huge role in our personalities, hence the term biological psychology. 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 Factor 1: Degree of neuroticism. Factor 2: Type of neuroticism. This was the basis of his original model of personality, which consisted of two very clearly