Fig. 4.

Decrease of neuronal distinction between own and conspecific's action during computer control test. (A) Higher activation with own action compared with conspecific's action (Left) decreased when conspecific was replaced by computer (Center). The difference recovered with reinstatement of conspecific (Right). Data are from a single striatal neuron. (B) Same as A, but higher activation with conspecific's action. (C) Kolmogorov-Smirnov statistics (D) for influence of computer opponent on actor specific neuronal responses. Empty bars, decreased difference own vs. conspecific's action with computer (9 activations); filled bars, maintained difference own vs. conspecific's action with computer (13 activations). (D and E) Simple action relationships fail to explain neuronal sensitivity for social action (D, average of 58 activations coding own social action; E, 36 activations coding conspecific's social action). Solid bars represent population activity during action of recorded monkey (normalized to maximum firing rate of individual neurons irrespective of trial type). Dashed bars represent activity in recorded monkey during conspecific's action. Response inhibition refers to absence of movements of recorded monkey. In No response inhibition trials, the recorded animal performed movements without being required. In D, neuronal activity was high in own trials but low in conspecific's trials irrespective of own inhibition. In E, neuronal activity was low in own trials but high in conspecific trials irrespective of own movement. Error bars show SEM.