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Neuroimage. 2007 Aug 15;37(2):504-7. Epub 2007 May 25.

Real-time functional brain mapping using electrocorticography.

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University of Washington, Department of Physics, Box 351560, Seattle, WA 98195-1560, USA.


We demonstrate the feasibility of real-time cortical mapping from arrays of subdural electrodes using the electrocorticographic signal power in the higher spectral frequencies (76-200 Hz, or "chi-index"). Hand area was mapped offline in eight individuals using brief baseline and hand-movement measurements. In one patient, hand sensorimotor cortex was identified online during a handshake. We propose that this high-frequency component of the electrocorticogram provides a generic, reliable, clinically useful correlate of local cortical function.

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