Abstract
When participants switch between relevant stimulus dimensions in speeded classification tasks, taskswitching cost is reduced by advance preparation. Previous studies in which speeded classification tasks were used have suggested that this effect results from attending to the relevant stimulus dimension. Because selective attention to the relevant stimulus dimension in same—different judgments is relatively poor (e.g., Santee & Egeth, 1980), it was predicted that advance task preparation for a shift in the relevant stimulus dimension would be compromised. This prediction was borne out in two experiments comparing dimension shifts (shape vs.fill) with task rule shifts (same? vs.different?) and shifts in the mapping of right—left keys toyes andto responses (yes—no vs.no—yes). The results indicate that advance attentional selection of the relevant dimension is an optional preparatory strategy in task switching, employed only in conditions enabling flexible refocusing of attention.
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This research was supported by a research grant from the Israeli Science Foundation to the first author.
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Meiran, N., Marciano, H. Limitations in advance task preparation: Switching the relevant stimulus dimension in speeded same—different comparisons. Memory & Cognition 30, 540–550 (2002). https://doi.org/10.3758/BF03194955
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DOI: https://doi.org/10.3758/BF03194955