Abstract
Inferior parietal lobule (IPL) neurons were studied when monkeys performed
motor acts embedded in different actions and when they observed similar
acts done by an experimenter. Most motor IPL neurons coding a specific
act (e.g., grasping) showed markedly different activations when this
act was part of different actions (e.g., for eating or for placing).
Many motor IPL neurons also discharged during the observation of
acts done by others. Most responded differentially when the same
observed act was embedded in a specific action. These neurons fired
during the observation of an act, before the beginning of the subsequent
acts specifying the action. Thus, these neurons not only code the
observed motor act but also allow the observer to understand the
agent's intentions.
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