Cognitive Neuroscience & Neuropsychology: PDF OnlyCoding of modified body schema during tool use by macaque postcentral neuroneslriki, Atsushi1,2; Tanaka, Michio1; Iwamura, Yoshiaki1Author Information 1Department of Physiology, Toho University School of Medicine, 2PRESTO, Research Development Corporation of Japan, 5–21-16 Omori-Nishi, Otaku, Tokyo 143, Japan NeuroReport: October 2, 1996 - Volume 7 - Issue 14 - p 2325-2330 Buy Abstract A tool is an extension of the hand in both a physical and a perceptual sense. The presence of body schemata has been postulated as the basis of the perceptual assimilation of tool and hand. We trained macaque monkeys to retrieve distant objects using a rake, and neuronal activity was recorded in the caudal postcentral gyrus where the somatosensory and visual signals converge. There we found a large number of bimodal neurones which appeared to code the schema of the hand. During tool use, their visual receptive fields were altered to include the entire length of the rake or to cover the expanded accessible space. These findings may represent neural correlates of the modified schema of the hand in which the tool was incorporated. © Lippincott-Raven Publishers.