We present and demonstrate a novel method for mapping local function in the brain using the power in the 76 to 200 Hz range (“chi band”) of the electrocorticographic (ECoG) signal. Current functional localization is based in electrical stimulation, and this method provides a new and compelling complement for real-time functional brain mapping. We implemented a simple integration of log power in this chi band (CBP) to functionally localize hand and language areas. Video taken during the real-time experiment demonstrates the efficacy of this technique during language and motor tasks, and interpolated brain maps from post hoc analyses illustrate the power of the method in a simple, intuitive manner. This novel method has potential use immediately for functional brain mapping in the context of neurosurgery.
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