Abstract
Foveal vernier resolution is impaired when a briefly presented target (T) is followed at varying stimulus onset asynchronies (SOA's) by a spatially adjacent set of metacontrast (M) bars. Impairment of resolution is optimal at intermediate SOA's (50–60 msec). When two flanking (F) bars are in turn placed adjacent to M and are presented either continuously throughout the T-M display sequence or else synchronously with T, a reduction of metacontrast effects at the previously optimal SOA′s occurs. Such a reduction does not occur when F is presented synchronously with M. In the framework of current neurophysiological interpretations of metacontrast. these results indicate that sustained channels inhibit transient channels.
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