Journal
PSYCHONOMIC BULLETIN & REVIEW
Volume 13, Issue 1, Pages 152-159Publisher
SPRINGER
DOI: 10.3758/BF03193827
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When people switch between two tasks, their performance on each is worse than when they perform that task in isolation. One theory of this switch cost is the failure-to-engage (FTE) theory, which posits that observed responses are a simple mixture of prepared and unprepared response strategies. The probability that participants use prepared processes can be manipulated experimentally (e.g., by changing preparation time). The FTE theory is a binary mixture model and therefore makes a strong prediction about the existence of fixed points in response time distributions. We found evidence contradicting this prediction, using data from 20 participants in a standard task-switching paradigm. In this article, we examine reasons for the failure of the FTE theory, and we demonstrate that a generalized version of FTE theory accommodates our data.
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