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Published March 13, 1997 | public
Journal Article

Coding of intention in the posterior parietal cortex

Abstract

To look at or reach for what we see, spatial information from the visual system must be transformed into a motor plan. The posterior parietal cortex (PPC) is well placed to perform this function, because it lies between visual areas, which encode spatial information, and motor cortical areas. The PPC contains several subdivisions, which are generally conceived as high-order sensory areas. Neurons in area 7a and the lateral intraparietal area fire before and during visually guided saccades. Other neurons in areas 7a and 5 are active before and during visually guided arm movements. These areas are also active during memory tasks in which the animal remembers the location of a target for hundreds of milliseconds before making an eye or arm movement. Such activity could reflect either visual attention or the intention to make movements. This question is difficult to resolve, because even if the animal maintains fixation while directing attention to a peripheral location, the observed neuronal activity could reflect movements that are planned but not executed. To address this, we recorded from the PPC while monkeys planned either reaches or saccades to a single remembered location. We now report that, for most neurons, activity before the movement depended on the type of movement being planned. We conclude that PPC contains signals related to what the animal intends to do.

Additional Information

© 1997 Nature Publishing Group. Received 10 December 1996; accepted 14 January 1997. We thank B. Gillikin for technical assistance and S. Gertmenian for editorial assistance. This work was supported by the National Eye Institute, Sloan Center for Theoretical Neurobiology at Caltech, Della Martin Foundation, and the Office of Naval Research.

Additional details

Created:
August 19, 2023
Modified:
October 23, 2023