Figure 7.

Examples of receptive field composition for neurons in area 5L from 4 cases (A–D). These examples demonstrate that receptive fields were complex and often involved several different portions of the forelimb such as the knuckles, wrist, and elbow (A) or elbow and shoulder (B; bottom figure). In some cases, neurons had bilateral receptive fields (B; top figure). Multiple digits were often encompassed in a receptive field (C) or relatively large portions of the palm were represented (D). Neurons at all of these sites responded to manipulation of the joints and muscles or taps to portions of the skin. The small insets below each case number illustrate portions of area 2 and area 5L and the location of the recording sites within area 5L that correspond to the receptive fields drawn for each case.