The Effects of the Spacing of Test Trials and Study Trials in Paired‐association Learning

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Abstract
The learning effects due to test and study trials after the initial presentation were examined in a paired‐associate learning paradigm. In Experiment 1 both the spacing and retention intervals were systematically varied. The results showed advantages of spacing for both test and study trials. However, the spacing function of test trials interacted significantly with the retention interval. At a short retention interval, the second recall was a decreasing function of spacing and paralleled closely the initial recall. As the retention interval increased, the spacing‐of‐test function assumed an inverted U‐shape. Performance after repeated studies was on the average better than after test trials. Experiment 2 confirmed that when an initial presentation was followed by two test trials, an increasing spacing interval between each successive test trial produced optimal long‐term performance. In the case where a second study trial was coupled with a test trial, a pattern with equal interval length was better than other spacing patterns. The proportion of test trials of the study list was also varied among groups of subjects. A higher proportion of test trials resulted in better final recall.

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