ABSTRACT
The somatosensory receptive fields (RFs) were on the hand or shoulders, arms, neck or face. Many of these bimodal neurons had bilateral RFs. The visual RF was in a limited region in the visual space just over the somatic RF and moved, keeping a close spatial relationship with the somatosensory counterpart. The size and configuration of the RFs were generally large and complex, and some of them were considered to be at the highest level of the hierarchical processing in the gyrus. In the postcentral gyrus of awake monkeys, there is a gradual and systematic increase in the RF size and in the complexity of response characteristics of single neurons along the rostro-caudal axis. In bimodal neurons found in the intraparietal sulcus region, visual responses were often dependent on the monkey’s arm position; strong responses were evoked by visual stimuli presented within reaching distance of the hand.
