Frequency, recency, and repetition effects on same and different response times.

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Abstract
Previous studies have suggested that the commonly reported finding that same response time (RT) is shorter than different RT in character comparison tasks may be due to differential practice, inasmuch as specific same pairs are more likely to recur than are specific different pairs given the stimulus sampling procedures that are typically used. In the present experiment with 26 Ss, the task was to judge whether the 2nd of 2 visually-presented letters was the same as the 1st. The frequency of occurrence of specific same and different letter pairings was varied systematically, while the proportion of same trials was held constant at .5. Results indicate that stimulus (or response) type had an effect on RT with same RTs less than different RTs. This effect could not be attributed to differential amounts of practice with specific same and different stimulus pairs. However, both same and different RT did vary inversely with the frequency. An attempt was made to distinguish the effects of frequency per se from those of recency and of repetitions or runs. (18 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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