ABSTRACT
Psychologists have recognized extroversion and introversion as aspects of temperament and personality throughout modern psychology. But it is the advancements in the field of neurobiology that has yielded the largest gains in our understanding of the field. H. Eysenck, too, believed that temperament was a matter of biology. He believed that the differences between extroversion and introversion lay in the brain chemistry systems involving arousal and inhibition, with extroverts relying more heavily on arousal for balance and introverts being inhibition dominant. Their biology, the parts related to introversion, are overactivated, resulting in brain chemistry that is out of sync. The same can happen when an extrovert becomes overstimulated by her dominant brain chemistry, resulting in myriad health problems related to an overexcited stress response.
