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Form and motion processing pathways of the primate visual system are known to be interconnected, but there has been surprisingly little investigation of how they interact at the cellular level. Here we explore this issue with a series of three electrophysiology experiments designed to reveal the sources of action selectivity in monkey temporal cortex neurons. Monkeys discriminated between actions performed by complex, richly textured, rendered bipedal figures and hands. The firing patterns of neurons contained enough information to discriminate the identity of the character, the action performed, and the particular conjunction of action and character. This suggests convergence of motion and form information within single cells. Form and motion information in isolation were both sufficient to drive action discrimination within these neurons, but removing form information caused a greater disruption to the original response. Finally, we investigated the temporal window across which visual information is integrated into a single pose (or, equivalently, the timing with which poses are differentiated). Temporal cortex neurons under normal conditions represent actions as sequences of poses integrated over approximately 120 ms. They receive both motion and form information, however, and can use either if the other is absent.

Temporal Cortex Neurons Encode Articulated Actions as Slow Sequences of Integrated Poses