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The article by Dr Ishiai and colleagues1 contains a critical piece of anatomical data (that is, the “sparing of the rostrum and the inferior half of the genu” (fig 1)) which has been ignored by the respected authors as to its probable role in underpinning the results they reported. This may have occurred because of their conventional theoretical perspective on motor control in the human, in the light of which such matters might be afforded. However, the doctrine of contralaterality of movement control (CMC) in humans has been recently revised2 to account for observations such as theirs in the sensory realm, as well as others in the motor realm that underpin the classical laterality indexed trilogy of contralateral hemiplegia/ipsilateral apraxia (with and without speech deficit); ipsilateral (non-dominant) weakness in lesions affecting the major hemisphere; and non-dominant weakness in lesions affecting the callosum.
The one-way callosal traffic theory (underpinning lateralities of executive functions) states that all voluntary actions involving the non-dominant hand entail a sequential activation (that is, major followed by minor hemisphere, mediated through the callosum) of a devoted neuronal aggregate …