Abstract
In this experiment, we investigated why the performance decline across a series of Brown-Peterson trials, using a constant short (30-sec) intertriai interval (ITI), is reversed by increasing the ITI on the subsequent trial. One interpretation is that the increased time serves as a marker that emphasizes the succeeding trial and its information, resulting in better recall. In the present experiment, we increased the ITI by presenting a word matrix to be read during the added time interval. For different groups the matrix was of the same semantic material as the memory triads, was quite similar, or was quite different. The amount of improvement on the next trial was a function of the degree of semantic disparity between the matrices and the memory triads. Mere presentation of the matrix was not sufficient to influence performance on the subsequent trial, but the semantic nature of the matrices did exert such an influence.
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