# PRIOR PROBABILITIES AND REPRESENTATIONAL MOMENTUM

### Abstract

In previous experiments on representational momentum, participants judged whether a probepresented after a target vanished was at the same location where that target vanished or at adifferent location. Two experiments manipulated actual or expected prior probability a sameresponse would be correct. In Experiment 1, a same response was correct on 10, 30, 50, 70,or 90% of trials, but participants were not informed of these probabilities. In Experiment 2, asame response was correct on 11% of trials, but participants were instructed a same responsewould be correct on 10, 30, 50, 70, or 90% of trials. Probabilities of same responses,weighted mean estimates of representational momentum, hit and false alarm rates, and d' andÎ² are reported. Actual or expected prior probability a same response would be correctinfluenced probability of same responses but did not influence representational momentum.
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