Abstract
We reported on a 77-year-old right-handed woman who manifested intermanual conflict due to cerebral infarction.
She showed the right hemiparesis and became mute at onset. A CT scan revealed an abnormally low density area in the regions of the anterior portion of cingulate gyrus and genu-trunk of corpus callosum. Though cerebral angiography revealed no steno-occlusive lesion, an abnormal intensity area was identified by MRI in the same regions as CT scan. Her motor weakness and muteness had improved several weeks after onset, and then instinctive grasp reaction of the right hand and intermanual conflict became the main symptoms: her left hand carried out her intention, but the right hand interfered compulsively with the acts being performed by the left hand. She was aware of the abnormal behavior of her right hand, but couldn't restrain the acts of the right hand.
It is said that the left hand usually displays interference in intermanual conflict. However, the present case was abnormal in that it showed effects contrary to those previously reported. In this case, motor co-ordination might be disturbed by the left anterior cingulate gyrus. At the same time, since corpus callosum was destroyed, then, her motor co-ordination might be disrupted from the right, normal, cingulate gyrus.
