Skip to Main content Skip to Navigation
Journal articles

Context-Related Frequency Modulations of Macaque Motor Cortical LFP Beta Oscillations

Abstract : The local field potential (LFP) is a population measure, mainly reflecting local synaptic activity. Beta oscillations (12-40 Hz) occur in motor cortical LFPs, but their functional relevance remains controversial. Power modulation studies have related beta oscillations to a ''resting'' motor cortex, postural maintenance, attention, sensorimotor binding and planning. Frequency modulations were largely overlooked. We here describe context-related beta frequency modulations in motor cortical LFPs. Two monkeys performed a reaching task with 2 delays. The first delay demanded attention in time in expectation of the visual spatial cue, whereas the second delay involved visuomotor integration and movement preparation. The frequency in 2 beta bands (around 20 and 30 Hz) was systematically 2-5 Hz lower during cue expectancy than during visuomotor integration and preparation. Furthermore, the frequency was directionally selective during preparation, with about 3 Hz difference between preferred and nonpreferred directions. Direction decoding with frequency gave similar accuracy as with beta power, and decoding accuracy improved significantly when combining power and frequency, suggesting that frequency might provide an additional signal for brain-machine interfaces. In conclusion, multiple beta bands coexist in motor cortex, and frequency modulations within each band are as behaviorally meaningful as power modulations, reflecting the changing behavioral context and the movement direction during preparation.
Document type :
Journal articles
Complete list of metadatas
Contributor : Alexa Riehle <>
Submitted on : Thursday, February 16, 2017 - 2:06:05 PM
Last modification on : Tuesday, December 8, 2020 - 10:20:17 AM


Explicit agreement for this submission




Bjørg Kilavik, Adrian Ponce-Alvarez, Romain Trachel, Joachim Confais, Sylvain Takerkart, et al.. Context-Related Frequency Modulations of Macaque Motor Cortical LFP Beta Oscillations. Cerebral Cortex, Oxford University Press (OUP), 2012, 22 (9), pp.2148-2159. ⟨10.1093/cercor/bhr299⟩. ⟨hal-00816339v2⟩



Record views


Files downloads