When Freud formulated his theories of psychoanalysis in the 1890s, he abandoned the physicalism of Brücke's position, but retained the search for universal laws and the emphasis on processes, or dynamics. ("Psychodynamic psychology" is a modern term that refers to Freud's theories of psychology and others like it that describe the mind in terms of dynamic interactions between different mental structures.) Freud's later focus on the sex drive can be seen, in two ways, as a result of his study under Brücke. First, the focus was a nod to physicalism–an attempt to link the vicissitudes of the mind to changes in the body (i.e. sexual arousal). Second, it was a strongly reductionistic approach–an attempt to boil down the huge complexity of human motivation into one basic drive. In Brücke's laboratory, Freud worked on brain anatomy and histology. His most
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