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Independent Brain Computer Interface Control using Visual Spatial Attention-Dependent Modulations of Parieto-occipital Alpha

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4 Author(s)
Kelly, S.P. ; Dept. of Electron. & Electr. Eng., Univ. Coll. Dublin ; Lalor, E. ; Reilly, R.B. ; Foxe, J.J.

Parieto-occipital alpha band (8-14 Hz) EEG activity was examined daring a spatial attention-based brain computer interface paradigm for its potential use as a feature for left/right spatial attention classification. In this paradigm 64-channel EEG data were recorded from subjects who covertly attended to a sequence of letters superimposed on a flicker stimulus in one visual field while ignoring a similar stimulus in the opposite visual field. Increases in alpha band activity were observed over parieto-occipital cortex contralateral to the location of the ignored stimulus, consistent with previous reports, and the subsequent use of alpha band power over bilateral parieto-occipital sites as a feature yielded an average classification accuracy of 73% across 10 subjects, with highest 87%. The highest achievable bit rate from these data is 7.5 bits/minute

Published in:

Neural Engineering, 2005. Conference Proceedings. 2nd International IEEE EMBS Conference on

Date of Conference:

16-19 March 2005