What are the features of anterior callosal apraxia?
An anterior callosal lesion disconnects the right premotor cortex (left hand) from the left hemisphere (left inferior parietal lobe), yielding an apraxia to verbal commands confined to the left hand (left ideomotor apraxia).
Sympathetic and anterior callosal apraxias are essentially the same syndrome due to interruption of the same pathway, but the lesion in sympathetic apraxia is much larger, causing other deficits (e.g., aphasia and hemiparesis).