Method and apparatus for visual - evoked responses

A - Human Necessities – 61 – B

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354/22, 326/12.6

A61B 5/04 (2006.01) A61B 5/0484 (2006.01) F02B 75/02 (2006.01)

Patent

CA 1242277

ABSTRACT OF THE DISCLOSURE In an apparatus for assessing visually-evoked response, wherein stimulus means are provided to present a variable visual pattern to an observer and analyzing means are provided to ana- lyze scalp potentials of the observer responsive to said pattern; the improvement wherein the stimulus means comprise means for temporal modulation of the pattern at a determined rate and simultaneously sweeping another visual parameter, in a determined period, in a range which crosses the observer's visual threshold for said other parameter, said analyzing means comprising means for synchronously demodulating said scalp potentials employing said determined rate of said reversing pattern as a reference, at a plurality of different phases with respect to said reference, for producing a display of the scalp potentials demodulated with different phase reference.

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