Cortical involvement in visual scan in the monkey.
Monkeys performed a visual search task for food reward. Green square targets were embedded in 3 x 3 arrays of colored forms. In distinct-feature arrays, all nontarget stimuli were red diamonds, whereas in shared-feature arrays, some nontarget stimuli shared either form (red square) or color (green diamond) with the target. Reaction time was slower for shared-feature arrays and linearly related to the number of shared-feature distractors. Errors were more common in shared-feature arrays, and shared-feature distractors were mistaken for targets more frequently than distinct-feature distractors. Event-related local field potentials were recorded from implanted transcortical electrodes. Significant task-related differences were obtained from association cortex, but not from projection cortex. Results are discussed in terms of the relative contribution of inferotemporal, dorsolateral frontal, and parietal cortex to feature-driven visual scan.
Bolster
R B
RB
University of Winnipeg, Ontario, Canada.
Pribram
K H
KH
D000818:Animals; D001522:Behavior, Animal; D003118:Color Perception; D004193:Discrimination Learning; D005074:Evoked Potentials, Visual; D005260:Female; D000882:Haplorhini; D010775:Photic Stimulation; D011930:Reaction Time; D013028:Space Perception; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*