Out with the old, in with the new: More valid measures of switch cost and retrieval time in the task span procedure |
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Authors: | Gordon D Logan |
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Institution: | Department of Psychology, Vanderbilt University, Nashville, TN 37203, USA. gordon.logan@vanderbilt.edu |
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Abstract: | Two experiments provided new measures of switch cost and retrieval time in the task span procedure. In Experiment 1, subjects
were given lists of six task names to remember, followed by six targets on which to perform the tasks named in the list. The
lists contained alternations and repetitions, and switch costs were estimated by comparing reaction time (RT) on alternation
and repetition trials. The experiment also included memory span and single task conditions, so switch costs could be estimated
by subtracting the sum of the RT in those conditions from the task span RT, as in the original report (Logan, 2004). The data
suggested that the original measure of switch cost was invalid and that the new measure was preferable. In Experiment 2, subjects
performed each task on the list twice. Retrieval was required on the first but not on the second trial in each pair. Retrieval
time was estimated by comparing the RT on trials that required retrieval with trials that did not require retrieval. This
measure was more valid than the RT in the memory span condition of Experiment 1, which was used in the original report. |
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