Exp. I investigated the effect of knowledge (K) of a 10-sec. ITI on estimates of four different durations (8, 12, 20, and 32 sec.). The main effect of K was significant (p < .005). Exp. II examined the effect of K over trials using a single interval (27 sec.). The main effect of K was significant (p < .005), but the K × trials interaction was not significant. The effect of K was immediate, and in both experiments, facilitated time estimation.
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