Coherent oscillations in monkey motor cortex and hand muscle EMG show task-dependent modulation

The Journal of Physiology
Stuart N BakerR N Lemon

Abstract

1. Recordings were made of local field potential (slow waves) and pyramidal tract neurone (PTN) discharge from pairs of sites separated by a horizontal distance of up to 1.5 mm in the primary motor cortex of two conscious macaque monkeys performing a precision grip task. 2. In both monkeys, the slow wave recordings showed bursts of oscillations in the 20-30 Hz range. Spectral analysis revealed that the oscillations were coherent between the two simultaneously recorded cortical sites. In the monkey from which most data were recorded, the mean frequency of peak coherence was 23.4 Hz. 3. Coherence in this frequency range was also seen between cortical slow wave recordings and rectified EMG of hand and forearm muscles active during the task, and between pairs of rectified EMGs. 4. The dynamics of the coherence were investigated by analysing short, quasi-stationary data segments aligned relative to task performance. This revealed that the 20-30 Hz coherent oscillations were present mainly during the hold phase of the precision grip task. 5. The spikes of identified PTNs were used to compile spike-triggered averages of the slow wave recordings. Oscillations were seen in 11/17 averages of the slow wave recorded on the same electrode a...Continue Reading

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Citations

Apr 11, 2006·Experimental Brain Research·Franca TecchioPaolo Maria Rossini
Jan 27, 2009·Experimental Brain Research·Benoit CarignanChristian Duval
Dec 17, 2009·Experimental Brain Research·Shashikala Kattla, Madeleine M Lowery
Nov 11, 2010·Experimental Brain Research·Jennifer L StephensonKatrina S Maluf
Feb 10, 2011·Experimental Brain Research·Vladimir Novakovic, Vittorio Sanguineti
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Jun 7, 2013·Annals of Biomedical Engineering·David J ClarkEvangelos A Christou
Sep 1, 2005·Journal of Computational Neuroscience·Madeleine M Lowery, Zeynep Erim
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Apr 28, 2004·NeuroImage·C Nicholas RiddleStuart N Baker
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Jan 6, 2000·Progress in Neurobiology·P Brown
Nov 24, 1999·Neuroscience Letters·T MimaM Hallett
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Sep 29, 2012·Journal of Neurophysiology·Claire L Witham, Stuart N Baker
Jan 27, 2012·Journal of Neurophysiology·Monica A PerezStuart N Baker
May 29, 2009·Journal of Neurophysiology·Elizabeth R WilliamsStuart N Baker

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