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T. Sato, A. Murthy, K. G. Thompson, J. D. Schall; Effects of perceptual load and response interference on target selection in macaque frontal eye field. Journal of Vision 2001;1(3):264. doi: 10.1167/1.3.264.
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© ARVO (1962-2015); The Authors (2016-present)
Laboratory for Sensorimotor Research, NEI, NIH Abstract: We have described a neural correlate of a selection process in the frontal eye field (FEF) of macaque monkeys performing visual search. Two manipulations were used to evaluate the hypothesis that the time of target discrimination observed in FEF represents the outcome of encoding and selection and not saccade preparation. The first manipulation reduced search efficiency by increasing the visual similarity of the target and distractors. The second manipulation introduced response interference by requiring monkeys to respond to unexpected changes of the location of the target. Both manipulations increased response time. However, the time of target discrimination observed in visually responsive FEF neurons was affected by search efficiency but not by response interference. We conclude, therefore, that target selection by visual neurons in FEF corresponds to the outcome of the perceptual stage of processing and precedes response preparation.
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