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88 reviewsWhile hippocampus represents spatial information through place cells forbody navigation, whether motor areas employ a similar framework to guidehand reaching remains unknown. Here, we investigate tuning properties indorsal premotor cortex (PMd) during naturalistic reach-and-grasp tasks in fourmonkeys. We find that 22% (132/601) of PMd neurons increase firing rates whenthe monkey’s hand occupies specific positions in space, forming the positionfields. These cells represent the hand position highly efficiently, achieving~80% accuracy for decoding hand trajectories with only 50 most dedicatedposition tuned cells ( ~ 10% of all recorded neurons). The hand position is corepresented with hand moving direction, speed, and reward location in thesame population of PMd neurons, forming a mixed-selective framework tointegrate positional and kinematic information. Our findings suggest field-likepositional coding may be a mechanism shared across brain regions for spatialrepresentation in goal-directed movements, including body navigation andforelimb reaching.
