Kelly S.P., Lalor E, Finucane C., Reilly R.B., A comparison of covert and overt attention as a control option in a steady-state visual evoked potential-based brain computer interface: 26th: September 1-5, 2004
EEG data were recorded from occipital scalp
regions of subjects who attended to an alternating
checkerboard stimulus in one visual field while ignoring a
similar stimulus of a different frequency in the opposite visual
field. Classification of left/right spatial attention is attempted
by extracting Steady-State Visual Evoked Potentials (SSVEPs)
elicited by the stimuli to assess the potential use of such a
spatial selective attention paradigm in a Brain Computer
Interface (BCI). Experimental setup and analysis procedure in
a previous study in which eye movement is permitted are
replicated in order to quantify differences in classification
performance using overt and covert attention. Four variations
of the basic paradigm, involving both feedback and addition of
extra mental load, are studied for comparison. The average
accuracy is found to be reduced by ~20% in the switch from
overt to covert attention when no other specifications of the
task are changed.
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