Behavioral laterality advance: Neuroanatomical evidence for the existence of hemisity

The new context of “Hemisity” has recently emerged. Hemisity asserts that a person is inherently either left or right brain-oriented in their thinking and behavioral styles. Such a binary situation would necessarily be demanded if there were only a single executive “observer” element, imbedded either on the left or right side of the brain. Because the anterior cingulate cortex (ACC) is the site of a major executive element of the brain, the hypothesis of a unilateral observer would predict that some element of well-known ACC anatomical asymmetries should be congruent with a subject’s hemisity. Here, this hypothesis was confirmed by the MRI-based discovery that in 146 of 149 cases (98%), Areas 24 and 24′ of the ACC were on average almost 50% thicker on the same brain side as the subject’s predetermined hemisity. Based upon this, the localization of the larger side of the ACC was used as a primary standard to calibrate recently developed biophysical methods and derivative preference questionnaires as well-correlated secondary standards for the determination of hemisity in individuals and groups without the use of MRI.