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. Author manuscript; available in PMC: 2010 Aug 11.
Published in final edited form as: Neurosurg Focus. 2009 Jul;27(1):E4. doi: 10.3171/2009.4.FOCUS0979

Fig. 3.

Fig. 3

Schematic showing a summary of the cortical sites and modalities used for BCI. The 3 fundamental signal modalities currently being explored include EEG, ECoG, and single-unit systems that record action potential firing from single neurons.