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The Journal of Neuroscience, December 17, 2003, 23(37):11741-11752

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Behavioral/Systems/Cognitive
Synchronous, Focally Modulated {beta}-Band Oscillations Characterize Local Field Potential Activity in the Striatum of Awake Behaving Monkeys

Richard Courtemanche,1 * Naotaka Fujii,2 * and Ann M. Graybiel2

1Department of Exercise Science, Concordia University, Montreal, Canada H4B 1R6, and 2Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, and the McGovern Institute for Brain Research, Cambridge, Massachusetts 02139

Synchronous oscillatory activity has been observed in a range of neural networks from invertebrate nervous systems to the human frontal cortex. In humans and other primates, sensorimotor regions of the neocortex exhibit synchronous oscillations in the {beta}-frequency band (~15-30 Hz), and these are also prominent in the cerebellum, a brainstem sensorimotor region. However, recordings in the basal ganglia have suggested that such {beta}-band oscillations are not normally a primary feature of these structures. Instead, they become a dominant feature of neural activity in the basal ganglia in Parkinson's disease and in parkinsonian states induced by dopamine depletion in experimental animals. Here we demonstrate that when multiple electrodes are used to record local field potentials, 10-25 Hz oscillations can be readily detected in the striatum of normal macaque monkeys. These normally occurring oscillations are highly synchronous across large regions of the striatum. Furthermore, they are subject to dynamic modulation when monkeys perform a simple motor task to earn rewards. In the striatal region representing oculomotor activity, we found that small focal zones could pop in and out of synchrony as the monkeys made saccadic eye movements, suggesting that the broadly synchronous oscillatory activity interfaces with modular spatiotemporal patterns of task-related activity. We suggest that the background {beta}-band oscillations in the striatum could help to focus action-selection network functions of cortico-basal ganglia circuits.

Key words: basal ganglia; synchrony; oculomotor; oscillation; ensemble recordings; network activity

Received April 30, 2003; revised October 7, 2003; accepted October 25, 2003.




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