Evolution of behavioral attractors with learning: Nonequilibrium phase transitions.

Zanone, Pier–Giorgio; Kelso, J. A. Scott

doi:10.1037/0096-1523.18.2.403

Cited by 449 publications

(443 citation statements)

References 39 publications

(74 reference statements)

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“…Small COM gain was considered improved balance control as participants stabilized their COM in space (Buchanan and Horak, 1999). Relative phase was calculated using the time values of the peaks to compute a point estimate of maximum COM relative to maximum platform position on a cycle-by-cycle basis (Zanone and Kelso, 1992). These values were averaged for each segment within a trial to determine mean relative phase and relative phase variability.…”

Section: Outcome Measuresmentioning

confidence: 99%

Compensatory postural adaptations during continuous, variable amplitude perturbations reveal generalized rather than sequence-specific learning

et al. 2008

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We examined changes in the motor organization of postural control in response to continuous, variable amplitude oscillations evoked by a translating platform and explored whether these changes reflected implicit sequence learning. The platform underwent random amplitude (maximum ± 15 cm) and constant frequency (0.5 Hz) oscillations. Each trial was composed of three 15-second segments containing seemingly random oscillations. Unbeknownst to participants, the middle segment was repeated in each of 42 trials on the first day of testing and in an additional seven trials completed approximately 24 hours later. Kinematic data were used to determine spatial and temporal components of total body centre of mass (COM) and joint segment coordination. Results showed that with repeated trials, participants reduced the magnitude of horizontal body COM displacement, shifted from a COM phase lag to a phase lead relative to platform motion and increased correlations between ankle/platform motion and hip/platform motion as they evolved from an ankle strategy to a multi-segment control strategy involving the ankle and hip. Maintenance of these changes across days provided evidence for learning. Similar improvements for the random and repeated segments, however, indicate that participants did not exploit the sequence of perturbations to improve balance control. Rather, the central nervous system (CNS) may have been tuning into more general features of platform motion. These findings provide important insight into the generalizabilty of improved compensatory balance control with training.jsfrank@uwindsor.ca,

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Section: Outcome Measuresmentioning

confidence: 99%

Compensatory postural adaptations during continuous, variable amplitude perturbations reveal generalized rather than sequence-specific learning

et al. 2008

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“…Carson, 1993). Key characteristics of such rhythmic coordination stem from the interactions between the moving limbs, due to which only two coordination patterns can be stably performed without training (e.g., Yamanishi, Kawato, & Suzuki, 1979;Zanone & Kelso, 1992): the in-phase pattern (i.e., the limbs oscillate symmetrically; relative phase / = 0°) and the antiphase pattern (i.e., the limbs oscillate in an alternating fashion; / = 180°). The stability properties of these twophase relations have been successfully accounted for by the well-known HKB model (Haken, Kelso, & Bunz, 1985).…”

Section: Asymmetries In Interlimb Coupling Strengthmentioning

confidence: 99%

Laterally focused attention modulates asymmetric coupling in rhythmic interlimb coordination

Poel

Peper

Beek

2006

Psychological Research

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Peters (J Motor Behav 21:151-155, 1989; Interlimb coordination: neural, dynamical and cognitive constraints, Academic, Orlando, pp 595-615, 1994) suggested that expressions of handedness in bimanual coordination may be reflections of an inherent attentional bias. Indeed, previous results indicated that focusing attention on one of the limbs affected the relative phasing between the limbs in a manner comparable to the effects of hand dominance. The present study extended the comparison between the effects of attentional focus and handedness by testing their impact on the interactions between the limbs. Both lefthanded and right-handed participants performed rhythmic bimanual coordination tasks (in-phase and antiphase coordination), while directing attention to either limb. Using brief mechanical perturbations, the degree to which the limbs were influenced by each other was determined. The results revealed that the non-dominant limb was more strongly affected by the dominant limb than vice versa and that, in line with Peters' proposition, this handedness-related asymmetry in coupling strength was reduced when attention was focused on the non-dominant limb, thereby highlighting the potential relation between inherent (handednessrelated) asymmetries and voluntary attentional asymmetries. In contrast to previous findings, the (commonly observed) phase lead of the dominant limb was attenuated (rather than accrued) when attention was focused on this limb. This unexpected result was explained in terms of the observed attention-related difference in amplitude between the limbs.

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“…Since the resump [1], i widely accepted that motor learning is a discontinuous, non-linear process, marked by deep qualitative behavioural reorganizations [2]- [3]. Moreover, motor learning is characterized by persistent change in behaviour over time [4].…”

Section: Introductionmentioning

confidence: 99%

Persistent coordination patterns in a complex task after 10 years delay

Nourrit-Lucas¹,

Zelic²,

Deschamps³

et al. 2013

Human Movement Science

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Evolution of behavioral attractors with learning: Nonequilibrium phase transitions.

Cited by 449 publications

References 39 publications

Compensatory postural adaptations during continuous, variable amplitude perturbations reveal generalized rather than sequence-specific learning

Compensatory postural adaptations during continuous, variable amplitude perturbations reveal generalized rather than sequence-specific learning

Laterally focused attention modulates asymmetric coupling in rhythmic interlimb coordination

Persistent coordination patterns in a complex task after 10 years delay

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