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Chimpanzees show similar personality traits to humans, Georgia State researchers say
Date:5/6/2014

cies toward dominance and disinhibition. Beta personalities, on the other hand, show low dominance and positive emotionality.

Further analysis shows these lower order traits also can be statistically broken down into their constituent parts. The research team identified five personality factors that combine differently in each individual chimpanzee: conscientiousness, dominance, extraversion, agreeableness and intellect. This echoes a well-known five-factor model of the human personality, although the specific factors are slightly different.

Now, for the neurobiology: many of those chimpanzee traits statistically correlate with the function of a neuropeptide called vasopressin. Chimps who were born with a common variant in the genes that control vasopressin behaved differently than their peers, the males showing more dominance and more disinhibition, but the females less of both.

This research shows not only a neurobiological basis for personality, but an evolutionary basis as well. The neurobiological bases of personality can vary according to the biological sex of the subject, at least in chimpanzees. Chimpanzee personality appears to have almost the same ingredients as human personalities, and that similarity seems to arise from the species' similar neurobiology.

"These results are particularly significant in light of the striking parallels between the major dimensions of personality found between chimpanzees and humans," said Sam Gosling, professor of psychology at the University of Texas at Austin and an internationally known researcher in cross-species personality research.


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Contact: Ann Claycombe
claycombe@gsu.edu
404-413-5047
Georgia State University
Source:Eurekalert

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