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The Journal of Neuroscience, July 2, 2003, 23(13):5446-5454

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Effects of Gaze Shifts on Maintenance of Spatial Memory in Macaque Frontal Eye Field

Puiu F. Balan and Vincent P. Ferrera

Department of Psychiatry, Center for Neurobiology and Behavior, and David Mahoney Center for Brain and Behavior Research, Columbia University, New York, New York 10032

The activity of 91 neurons in the frontal eye fields (FEFs) of two macaque monkeys was recorded while the animals performed a delayed spatial match-to-sample task. During the delay, the animals were required to shift their gaze to one of four eccentric locations. Neuronal activity during the delay was analyzed for sensitivity to cue location and eye position. One-third of the neurons showed significant delay activity selective for cue location, whereas slightly more than one-half of the neurons showed significant modulation of delay activity when the gaze was shifted to an eccentric location. Despite this modulation, the neurons continued to signal their preferred cue location during most of the delay. However, after recentering saccades, the memory signal was temporarily abolished and then reemerged over a period of few hundred milliseconds. This is consistent with the idea that spatial working memory is buffered outside of the FEF. For most neurons, delay activity tended to increase when the gaze was shifted away from the preferred location and to decrease when the gaze was shifted toward the preferred location. This pattern of modulation is consistent with a vector subtraction mechanism that allows for the superposition of multiple saccade plans.

Key words: eye position; gain modulation; spatial memory; saccade planning; sensorimotor transformation; prefrontal cortex

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Received Mar. 14, 2003; revised Apr. 16, 2003; accepted Apr. 17, 2003.

This article has been cited by other articles:

				C. R. Cassanello, A. T. Nihalani, and V. P. Ferrera Neuronal Responses to Moving Targets in Monkey Frontal Eye Fields J Neurophysiol, September 1, 2008; 100(3): 1544 - 1556. [Abstract] [Full Text] [PDF]

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