| 摘要 |
<p>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 analyze scalp potentials of the observer responsive to said pattern; the improvement wherein the stimulus means comprise means for reversing the pattern at a determined rate and simultaneously sweeping another visual parameter, in a determined period, in a range to cross the visual threshold of 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.</p> |
