ECoGElectrocorticography (ECoG) records the “high-gamma” (>60 Hz) frequency profile of the cortex, featuring a temporal resolution of the order of milliseconds [1].

Coupled with a software interface, the use of ECoG was explored in a Brain Computer Interface study when participants were asked to either think or say different vowel sounds [2]. While the recorded frequencies were assigned to distinct actions, participants were able to move a screen cursor by saying or thinking of sounds. Although a surgery is required for the positioning of the electrodes in ECoG, the neural activity recording process is non-invasive as electrodes are not inserted into the cortex [3].

[1] Gaona et al. Nonuniform high-gamma (60-500 Hz) power changes dissociate cognitive task and anatomy in human cortex. J Neurosci (2011) vol. 31 (6) pp. 2091-100 | DOI

[2] Leuthardt et al. Using the electrocorticographic speech network to control a brain-computer interface in humans. J Neural Eng (2011) vol. 8 (3) pp. 036004 | DOI

[3] ‘Brain-listening’ Method May Lead to Better Machine Interfaces

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