Angular gyrus and TPO connect vision and hearing sense qualities to cause synesthesia. Hand and mouth motor areas are adjacent and move similarly {synkinesia}. Visual areas link to Broca's motor area. Emotional vocalizations start from right hemisphere and anterior cingulate. Perhaps, visual-auditory, hand-mouth, and mouth-visual brain areas evolve to work together {synesthetic bootstrapping theory}. Perhaps, tool-making steps became syntax and nested phrases {hierarchic embedding} [Ramachandran, 2004].
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Date Modified: 2022.0224