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Local field potential oscillations in primate cerebellar cortex: modulation during active and passive expectancy.
Richard Courtemanche1, Jean-Pierre Pellerin, Yves Lamarre
1Département de Physiologie and Centre de Recherche en Sciences Neurologiques, Université de Montréal, Quebec H3C 3J7, Canada.
Journal of Neurophysiology
|August 7, 2002
Summary
Cerebellar local field potential (LFP) oscillations in monkeys reliably signal periods of expectancy, whether for active movement or passive reward. These brain rhythms appear during waiting and cease with event initiation, highlighting a role in anticipating outcomes.
Area of Science:
- Neuroscience
- Cerebellar Function
- Electrophysiology
Background:
- Cerebellar local field potential (LFP) oscillations are implicated in motor control and cognitive functions.
- The specific role of these oscillations during periods of expectancy, particularly in the paramedian lobule, remains to be fully elucidated.
Purpose of the Study:
- To investigate the presence and modulation of cerebellar LFP oscillations in the paramedian lobule during active motor tasks and passive reward expectancy.
- To determine if these oscillations are associated with the anticipation of both self-initiated actions and externally triggered events.
Main Methods:
- Recorded LFP oscillations in the paramedian lobule of monkeys during active elbow flexion-extension/lever-press tasks and passive waiting periods for reward.
- Analyzed phase-locking of multi-unit activity and Purkinje cell simple spikes with LFP oscillations.
- Compared oscillation modulation across active and passive conditions, including variations in task training and reward delivery.
Main Results:
- Idiosyncratic LFP oscillation frequencies (13-25 Hz) were observed in individual monkeys.
- Granule cell multi-unit activity and Purkinje cell simple spikes showed phase-locking with LFP oscillations.
- LFP oscillations were modulated during active tasks, appearing during movement preparation and stopping with initiation.
- Surprisingly, LFP oscillations were also modulated during passive waiting periods, strengthening as reward time approached and ceasing at the expected reward window, irrespective of actual reward.
Conclusions:
- Cerebellar LFP oscillations in the paramedian lobule are consistently present during periods of expectancy, regardless of whether the anticipated event is self-initiated or externally triggered.
- These findings provide electrophysiological evidence for a specific cerebellar activity pattern associated with the anticipation of predictable events.