Concept identification: The effects of varying length and informational components of the intertrial interval.

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Abstract
In Exp. 1, Ss solved concept-identification problems under conditions formed by combining: 4 intertrial durations (1-25 sec.); 2 levels of task complexity (1 and 5 irrelevant stimulus dimensions); and 2 modes of controlling duration of stimulus patterns (self-paced vs. fixed interval). Performance (a) improved, then got worse with increases in the interval, the optimal length being greater in more complex problems, and (b) was unaffected by mode of stimulus control. In Exp. 2, Ss served in 4 intertrial conditions: (a) simple time-out alone; (b) display of stimulus pattern; (c) display of signal indicating response correctness; or (d) both b, and c. 3 intertrial durations were used for each condition: 1, 15, or 29 sec. Trends were the same but performance did not worsen during longer intervals under Conditions b and d. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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