Abstract
We reported a case of one-way disturbance of somesthetic transfer, from the left to right hand together with left tactile anomia but without left agraphia and left apraxia, after traumatic brain injury. From the viewpoint of brain mechanisms underlying cross-communication, we hypothesized that the patient had no deficit in the connection between the motor association cortex in both hemispheres, but did show a deficit in the connection between the somatosensory association cortex in both hemispheres. Lesions in the corpus callosum suggested that in the case of cross-communication from the left to right hand and left tactile naming, information might be transferred through the dosal part of the posterior truncus which connects the somatosensory association cortex in both hemispheres, while in the case of cross-communication from the right to left hand and writing with the left hand, information might be transferred through the anterior part of the posterior truncus which connects the motor association cortex in both hemispheres.
