Summary
This paper addresses the question of whether a simple two-stage account of variability in timing developed for single-hand repetitive tapping is applicable to regular tapping with the hands in alternation. The task required key presses at a steady rate, previously set by a periodic auditory signal. On separate blocks of trials four subjects used the index finger of the left hand or of the right hand at intervals of 200, 400, and 800 ms or alternated between the hands at intervals of 100, 200, or 400 ms. For each subject the variability of the between-hand intervals in the 200- and 400-ms alternate-hand conditions was greater than the variability of the same interval in the single-hand conditions. In the 100-ms alternate-hand condition correlations between adjacent (between-hand) intervals were reliably less then −.5. These results are inconsistent with the simple two-stage model, and two variants are shown to provide a better qualitative fit to at least some aspects of the data.
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Wing, A.M., Church, R.M. & Gentner, D.R. Variability in the timing of responses during repetitive tapping with alternate hands. Psychol Res 51, 28–37 (1989). https://doi.org/10.1007/BF00309273
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DOI: https://doi.org/10.1007/BF00309273