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The Journal of Neuroscience, July 30, 2003, 23(17):6798-6809
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Coherent Oscillations in Neuronal Activity of the Supplementary Motor Area during a Visuomotor Task
Daeyeol Lee
Department of Brain and Cognitive Sciences, Center for Visual Science,
University of Rochester, Rochester, New York 14627
Neural activity recorded in behaving animals is nonstationary, making it
difficult to determine factors influencing its temporal patterns. In the
present study, rhesus monkeys were trained to produce a series of visually
guided hand movements according to the changes in target locations, and
multichannel single-neuron activity was recorded from the caudal supplementary
motor area. Coherent oscillations in neural activity were analyzed using the
wavelet cross-spectrum, and its statistical significance was evaluated using
various methods based on surrogate spike trains and trial shuffling. A
population-averaged wavelet cross-spectrum displayed a strong tendency for
oscillatory activity in the  frequency range (30 50 Hz) to
synchronize immediately before and after the onset of movement target. The
duration of synchronized oscillations in the frequency range increased
when the onset of the next target was delayed. In addition, analysis of
individual neuron pairs revealed that many neuron pairs also displayed
coherent oscillations in the  frequency range (15-30 Hz). Coherent
frequency oscillations were less likely to be synchronized than
frequency oscillations, consistent with the fact that coherent
frequency oscillations were not clearly seen in the population-averaged
cross-spectrum. For a given neuron pair, the time course and phase of coherent
oscillations were often similar across different movements. These results are
consistent with the proposal that synchronized oscillations in the
frequency range might be related to the anticipation of behaviorally relevant
events and the contextual control of cortical information flow.
Key words: neuron assemblies; monkey; SMA; spike synchrony; wavelet cross-spectrum; sequence learning
Received Apr. 9, 2003;
revised May. 28, 2003;
accepted May. 29, 2003.
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