title: Concurrent cognitive task modulates coordination dynamics.
abstract: Does a concurrent cognitive task affect the dynamics of bimanual rhythmic coordination? In-phase coordination was performed under manipulations of phase detuning and movement frequency and either singly or in combination with an arithmetic task. Predicted direction-specific shifts in stable relative phase from 0° due to detuning and movement frequency were amplified by the cognitive task. Nonlinear cross-recurrence analysis suggested that this cognitive influence on the locations of the stable points or attractors of coordination entailed a magnification of attractor noise without a reduction in attractor strength. An approximation to these findings was achieved through parameter changes in a motion equation in relative phase. Results are discussed in terms of dual-task performance as limited resources, dynamics rather than chronometrics, and reparameterization rather than degradation.
authors.affiliation: Department of Physical Therapy, University of ConnecticutDepartment of Psychology, University of CincinnatiDepartment of Psychology & Center for the Ecological Study of Perception and Action, University of Connecticut.
authors.forename: Geraldine L
authors.initials: GL
authors.lastname: Pellecchia
authors.forename: Kevin
authors.initials: K
authors.lastname: Shockley
authors.forename: M T
authors.initials: MT
authors.lastname: Turvey