Variability in the structure of field 39 of the lower parietal area of the cortex in the left and right hemispheres of adult human brains.

The cytoarchitectonics of field 39 of the lower parietal area of the cortex in the left and right hemispheres were studied in normal individuals and professionally gifted world-famous people. Series of frontal sections were studied, stained by the Nissl cresyl violet method. The profile area of neurons was measured in layers III and V and the distribution of neurons in terms of this property was analyzed. Gifted people showed a significantly greater level of individual variability in the measures recorded here, especially in the right hemisphere, with larger proportions of very small and very large neurons.