Dynamics of 1 : 2 coordination: Temporal scaling, latent 1 : 1, and bistability

Author(s): Turvey, M. T., Saltzman, E. L.

Journal/Book: J Motor Behav. 1999; 31: 1319 Eighteenth St NW, Washington, DC 20036-1802, USA. Heldref Publications. 236-247.

Abstract: The simplest interlimb multifrequency coordination of 1:2 can be performed at different speeds and in at least two different styles or modes. The effects of speed and mode (in-phase or antiphase) were evaluated in a bimanual 1:2 rhythmic task in which participants (N = 8) oscillated hand-held pendulums with identical or different uncoupled frequencies. A motion equation in relative phase that captures the asymmetries of components and task predicted the 1:2 coordination equilibria resulting from temporal scaling. According to the experimental results, both coordination; modes proved to be equally stable. More detailed analyses of individual trials showed signs that the more fundamental 1:1 coordination intruded into the 1:2 coordination.

Note: Article Sternad D, Penn State Univ, Dept Kinesiol, 266 Recreat Bldg, University Pk,PA 16802 USA

Keyword(s): bimanual coordination; coupled oscillators; multifrequency coordination; PROPORTIONAL DURATION MODEL; HUMAN HAND MOVEMENTS; MULTIFREQUENCY COORDINATION; RHYTHMIC COORDINATION; PHASE-TRANSITIONS; 2 HANDS; INVARIANCE; PERFORMANCE; OSCILLATORS; CONSTRAINTS

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