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Perceptual or motor learning in SRT tasks with complex sequence structures

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Abstract

We investigated under which conditions sequence learning in a serial reaction time task can be based on perceptual learning. A replication of the study of Mayr (1996) confirmed perceptual and motor learning when sequences were learned concurrently. However, between-participants manipulations of the motor and perceptual sequences only supported motor learning in cases of more complex deterministic and probabilistic sequence structures. Perceptual learning using a between-participants design could only be established with a simple deterministic sequence structure. The results seem to imply that perceptual learning can be facilitated by a concurrently learned motor sequence. Possibly, concurrent learning releases necessary attentional resources or induces a structured learning condition under which perceptual learning can take place. Alternatively, the underlying mechanism may rely on binding between the perceptual and motor sequences.

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Notes

  1. Although Experiments 2–4 show no trend toward perceptual learning, it could be remarked that more statistical power in these experiments is required in order to accept an absence of perceptual learning. Therefore, to determine whether perceptual learning effects would come about when statistical power was increased, we conducted a repeated measures ANOVA on the combined data of the perceptual conditions of all three Experiments 2–4, with sequence structure (32, 12 or probabilistic in Experiments 2, 3, and 4 respectively) as between-participants factor and block as within-participants factor. With a total sample size of 48 participants, neither the main effect of sequence structure nor the interaction between block and sequence proved to be significant respectively F(2,45) = .95, p = .40 and F(18,405) = .81, p = .70. This allowed us to further analyze perceptual learning in the form of an increase in RT in the random Block 9 compared with the surrounding structured Blocks 8 and 10. Even across 48 participants, planned comparisons revealed that perceptual learning did not emerge, F(1,45) = 1.48, p = .23. Hence, the combined analysis of the data of Experiments 2–4 shows that perceptual learning is still absent when the statistical power is increased. Nevertheless, we were always able to assess clear motor learning effects in Experiments 2–4, although the samples used to assess motor and perceptual learning were always comparable. This indicates that a lack of statistical power probably cannot explain the absence of perceptual learning in Experiments 2–4. Even if it is assumed that perceptual learning in Experiments 2–4 was indeed present, but that the effect was so small that it required more statistical power (than motor learning) to be detected, the difference between the motor and perceptual condition remains. Hence, it can only be concluded that sequence learning primarily relies on motor learning and that this type of learning is much more dominant than perceptual learning.

  2. We would like to thank the reviewers for these suggestions.

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Acknowledgements

The first author, Natacha Deroost, is holder of the mandate of Aspirant of the National Fund for Scientific Research of Flanders, Belgium (Fonds voor Wetenschappelijk Onderzoek—Vlaanderen, FWOTM247).

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Correspondence to Natacha Deroost.

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Deroost, N., Soetens, E. Perceptual or motor learning in SRT tasks with complex sequence structures. Psychological Research 70, 88–102 (2006). https://doi.org/10.1007/s00426-004-0196-3

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