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J Neurophysiol 93: 884-908, 2005. First published August 4, 2004; doi:10.1152/jn.00305.2004
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Neuronal Activity in Macaque SEF and ACC During Performance of Tasks Involving Conflict

Kae Nakamura1,2, Matthew R. Roesch1,2 and Carl R. Olson1,2

1Center for the Neural Basis of Cognition, Mellon Institute, Pittsburgh, Pennsylvania; and 2Department of Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania

Submitted 25 March 2004; accepted in final form 29 July 2004

It has been suggested on the basis of previous studies involving functional MRI (fMRI) and single-neuron recording that neurons of the supplementary eye field (SEF) and anterior cingulate cortex (ACC) monitor conflict. To test this idea, we carried out microelectrode recording in monkeys performing a color-conditional eye movement task in which red and green cues instructed leftward and rightward saccades, respectively. In a variant inducing conflict by spatial incompatibility, the cue was presented either at the location of the target (no conflict) or opposite the location of the target (conflict). In a variant inducing conflict by reversal, the foveal cue either remained one color (no conflict) or reversed color after 100 ms (conflict), with the monkey required to follow the instruction conveyed by the second color. In both tasks, conflict was evident in behavioral measures (reduced percent correct and slowed reaction time) and in physiological measures (reduced strength of directional activity among direction-selective neurons). In the SEF, there was a tendency for neurons to fire more strongly on trials involving conflict, but this effect took the form of modulation of task-related activity among direction-selective neurons, not of a pure conflict-monitoring signal. In the ACC, there was no conflict-related enhancement. These results are incompatible with the idea that the SEF and ACC contain populations of neurons specialized for monitoring conflict.

Address for reprint requests and other correspondence: C. R. Olson, Center for the Neural Basis of Cognition, Mellon Inst., Rm. 115, 4400 Fifth Ave., Pittsburgh, PA 15213-2683 (E-mail: colson{at}cnbc.cmu.edu)




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