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01-03-2006 | Original Article

How does practice reduce dual-task interference: Integration, automatization, or just stage-shortening?

Auteurs: Eric Ruthruff, Mark Van Selst, James C. Johnston, Roger Remington

Gepubliceerd in: Psychological Research | Uitgave 2/2006

Abstract

The present study assessed three hypotheses of how practice reduces dual-task interference: Practice teaches participants to efficiently integrate performance of a task pair; practice promotes automatization of individual tasks, allowing the central bottleneck to be bypassed; practice leaves the bottleneck intact but shorter in duration. These hypotheses were tested in two transfer-of-training experiments. Participants received one of three training types (Task 1 only, or Task 2 only, or dual-task), followed by dual-task test sessions. Practice effects in Experiment 1 (Task 1: auditory–vocal; Task 2: visual–manual) were fully explained by the intact bottleneck hypothesis, without task integration or automatization. This hypothesis also accounted well for the majority of participants when the task order was reversed (Experiment 2). In this case, however, there were multiple indicators that several participants had succeeded in eliminating the bottleneck by automatizing one or both tasks. Neither experiment provided any evidence that practice promotes efficient task integration.

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Stage-shortening is an inevitable consequence of task practice. It plays a critical role in the intact bottleneck hypothesis—in fact, it is the sole cause of PRP reduction. Although the task integration and task automatization hypotheses also allow for stage-shortening, it is not assumed to be the principle cause of PRP reduction (e.g., if the bottleneck is bypassed, then interference will be small regardless of stage durations).

A chi-squared test revealed that this difference is statistically significant, χ²(1) = 5.581, p < .05. The difference between experiments is also significant using Fisher’s exact test (p = .0497, two-tailed), which is more appropriate given cell frequencies less than 5.

One complication for the hypothesis that Task 2 automatization was the key to bypassing the bottleneck is that one of the bypassers had not practiced Task 2 during the training phase. Nevertheless, this individual did respond very quickly to Task 2 at the long SOA (M = 376 ms) but not to Task 1 (M = 527 ms). It is possible that this person was naturally skilled at Task 2 and was able to achieve automatization relatively quickly (e.g., during the practice session).

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Titel: How does practice reduce dual-task interference: Integration, automatization, or just stage-shortening?
Auteurs: Eric Ruthruff
Mark Van Selst
James C. Johnston
Roger Remington
Publicatiedatum: 01-03-2006
Uitgeverij: Springer-Verlag
Gepubliceerd in: Psychological Research / Uitgave 2/2006
Print ISSN: 0340-0727
Elektronisch ISSN: 1430-2772
DOI: https://doi.org/10.1007/s00426-004-0192-7

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