Influence of Stimulus Discriminability on Psychological Refractory Period Effect
Keyword(s):
10 undergraduate students were tested in a psychological refractory period paradigm. Stimulus 1 was a visual discrimination task (same-different) and S2 was a 1,000-Hz tone. Discriminability of S1 and ISI were varied. Ss always had to respond to S2, but to S1 only when it was “same.” Discriminability of S1 was found to affect R2, irrespective of whether or not S1 was followed by an overt response. Such a result poses difficulties to expectancy and response-conflict theory.
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