The cognitive side of motor control
The cognitive side of motor control
There are three core manifestations of apraxia that are exclusively bound to left-hemisphere damage: imitation of meaningless hand postures, use of single mechanical tools, and pantomime of tool use. Their functional communality is the central role of segmentation and combination. For imitation of hand postures, visual features of the demonstrated gesture are segmented into distinct body parts which are combined for reproducing the hand posture. For use of single mechanical tools the structures of tool and recipient are segmented into functionally significant traits which are combined to form a mechanical chain from the manual action to its impact on the distal recipient. For pantomime of tool use the compound image of hand, action, and object is segmented into distinctive features of the object and the acting hand which are combined to form a comprehensible image of the pretended object and its use. Possibly segmentation and combination have their neural counterpart in hemisphere asymmetries of white matter distribution.
Keywords: apraxia, anatomy, white matter, parietal lobe, temporal lobe, frontal lobe, language, hemisphere asymmetry, laterality
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