Temporal Precision of Spike Trains in Extrastriate Cortex of the Behaving Macaque Monkey

Creators: Bair, Wyeth; Koch, Christof

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Abstract

How reliably do action potentials in cortical neurons encode information about a visual stimulus? Most physiological studies do not weigh the occurrences of particular action potentials as significant but treat them only as reflections of average neuronal excitation. We report that single neurons recorded in a previous study by Newsome et al. (1989; see also Britten et al. 1992) from cortical area MT in the behaving monkey respond to dynamic and unpredictable motion stimuli with a markedly reproducible temporal modulation that is precise to a few milliseconds. This temporal modulation is stimulus dependent, being present for highly dynamic random motion but absent when the stimulus translates rigidly.

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© 1996 The MIT Press. Received August 7, 1995, accepted February 2, 1996. We thank William T. Newsome for kindly providing data collected in his laboratory and for extensive critical discussion that has shaped the course of this analysis. Kenneth H. Britten, Michael N. Shadlen, Ehud Zohary, and J. Anthony Movshon have contributed greatly through critical discussion and by sharing data that they have collected. This work was funded by the Office of Naval Research and the Air Force Office of Scientific Research. W.B. was supported by the L.A. Hanson Foundation.

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