... "versus- out-going, even loud people. This dimension, too, is found in everyone, but the physiological explanation is a bit more complex. Evidence indicates that this personality variable has a large heritability component (Burger, 2000). He hypothesized that extraversion-introversion is a matter of the balance of "inhibition- and "excitation- in the brain itself. Excitation is the brain waking itself up, getting into an ... case of an overwhelming stimulation. Another Theorist associated with the biological perspective is Raymond Cattell. He was a theorist-researcher like Eysenck who h...

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