Date of Degree
PhD (Doctor of Philosophy)
First Committee Member
Susan Wagner Cook
Second Committee Member
Third Committee Member
Fourth Committee Member
Fifth Committee Member
Why are dual-task costs reduced with ideomotor (IM) compatible tasks (see e.g. Greenwald & Shulman, 1973)? In a series of experiments, I tested the way in which task structure affects dual-task performance (Halvorson et al., 2012). The results suggest that in some cases, typical dual-task costs arise from task structure rather than response limitations. Further examination of this question has shown that dual-task costs cannot be predicted solely on the basis of the relationship between the stimuli and the responses; the relationship between the tasks, or the task pairing, plays a critical role in whether the tasks overlap and performance is impaired. A series of experiments using novel task pairings showed that when one task uses a spatial central code and the other uses a verbal central code, dual-task costs are eliminated.
Dual-task costs, task structure
viii, 211 pages
Includes bibliographical references (pages 193-211).
Copyright 2013 Kimberly Mae Halvorson
Halvorson, Kimberly Mae. "What causes dual-task costs?." PhD (Doctor of Philosophy) thesis, University of Iowa, 2013.