Abstract
Introduction: Recently, three independent, intercorrelated biophysical measures have provided the first quantitative measures of a binary form of behavioral laterality called “Hemisity,” a term referring to inherent opposite right or left brain-oriented differences in thinking and behavioral styles. Crucially, the right or left brain-orientation of individuals assessed by these methods was later found to be essentially congruent with the thicker side of their ventral gyrus of the anterior cingulate cortex (vgACC) as revealed by a 3 min MRI procedure. Laterality of this putative executive structural element has thus become the primary standard defining individual hemisity. Methods: Here, the behavior of 150 subjects, whose hemisity had been calibrated by MRI, was assessed using five MRI-calibrated preference questionnaires, two of which were new. Results: Right and left brain-oriented subjects selected opposite answers (p > 0.05) for 47 of the 107 “either-or,” forced choice type preference questionnaire items. The resulting 30 hemisity subtype preference differences were present in several areas. These were: (1) in logical orientation, (2) in type of consciousness, (3) in fear level and sensitivity, (4) in social-professional orientation, and (5) in pair bonding-spousal dominance style. Conclusions: The right and left brain-oriented hemisity subtype subjects, sorted on the anatomical basis of upon which brain side their vgACC was thickest, showed 30 significant differences in their “either-or” type of behavioral preferences.
Highlights
Three independent, intercorrelated biophysical measures have provided the first quantitative measures of a binary form of behavioral laterality called “Hemisity,” a term referring to inherent opposite right or left brain-oriented differences in thinking and behavioral styles
0.37 to 0.66, indicating that more than one of these questionnaires would be required to determine individual hemisity, if this were to be the sole method of assessment
The associations among the six secondary hemisity instruments, as well as hemisity, determined by the average hemisity outcome of the combination of these six binary assays (Hemisity-6), by the two additional questionnaires (BQ and HQ), and hemisity determined by anterior cingulate MRI asymmetry were examined using cross tabulations and chi square analyses (Table 2)
Summary
Three independent, intercorrelated biophysical measures have provided the first quantitative measures of a binary form of behavioral laterality called “Hemisity,” a term referring to inherent opposite right or left brain-oriented differences in thinking and behavioral styles. The right or left brain-orientation of individuals assessed by these methods was later found to be essentially congruent with the thicker side of their ventral gyrus of the anterior cingulate cortex (vgACC) as revealed by a 3 min MRI procedure. Based on this binary concept, three independent, but highly intercorrelated biophysical methods (dichotic deafness, two-hand line bisection, two-hand mirror tracing) have shown persistent significant differences between individuals (Morton, 2001, 2002, 2003a,b,c) The results of these methods were confirmed and amplified by the MRI demonstration that the ventral region of the dorsal anterior cingulate cortex was thickest on the same side of the subject’s brain as their biophysically predetermined hemisity [in 130 of 133 subjects (98%), Morton and Rafto, 2010]
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