Journal
JOURNAL OF NEUROSCIENCE
Volume 29, Issue 10, Pages 3132-3137Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.5506-08.2009
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Funding
- National Science Foundation [0622252, 0130705]
- Direct For Computer & Info Scie & Enginr
- Division of Computing and Communication Foundations [0622252, 0130705] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0930908] Funding Source: National Science Foundation
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During active movement the electric potentials measured from the surface of the motor cortex exhibit consistent modulation, revealing two distinguishable processes in the power spectrum. At frequencies <40 Hz, narrow-band power decreases occur with movement over widely distributed cortical areas, while at higher frequencies there are spatially more focal power increases. These high-frequency changes have commonly been assumed to reflect synchronous rhythms, analogous to lower-frequency phenomena, but it has recently been proposed that they reflect a broad-band spectral change across the entire spectrum, which could be obscured by synchronous rhythms at low frequencies. In 10 human subjects performing a finger movement task, we demonstrate that a principal component type of decomposition can naively separate low-frequency narrow-band rhythms from an asynchronous, broad-spectral, change at all frequencies between 5 and 200 Hz. This broad-spectral change exhibited spatially discrete representation for individual fingers and reproduced the temporal movement trajectories of different individual fingers.
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