Dynamical Models of Rhythmic Interlimb Coordination

Peper, C Lieke E; Daffertshofer, Andreas; Beek, Peter J.

doi:10.1007/978-1-4419-9056-3_11

Cited by 5 publications

(4 citation statements)

References 80 publications

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“…Although the obtained TCV values were symmetric around the 1:1 amplitude ratio, the Δφ curve was shifted upward (indicating D arm lead) especially at the higher movement frequency. These results, as obtained for our right-handed participants, are in agreement with the effects of the handedness-related parameter d in Equation 3 and are therefore in accordance with the asymmetric relative phase dynamics that encompass a handedness-related asymmetry in coupling strength (de Poel et al, 2007; Peper, Daffertshofer, & Beek, 2004; Treffner & Turvey, 1995). In addition, the observation that the pattern of results is clearly mirror symmetric around the 1:1 amplitude ratio (see Figures 1A and 1B) can be explained with reference to (symmetry) group theory (Mulvey, Amazeen, & Riley, 2005).…”

Section: Methodssupporting

confidence: 90%

“…According to Equation 3, a shift in relative phasing (Δφ) only occurs when Δω ≠ 0, c ≠ 0, and/or d ≠ 0. Parameters a and b , however, do not contribute to asymmetries in the relative phase dynamics, because they support attraction toward the (symmetric) stable solutions of φ = 0° and φ = 180° (see de Poel et al, 2007; Peper, Daffertshofer, & Beek, 2004). Hence, although asymmetric contributions of the coupling influences between the arms (i.e., from the attended arm onto the unattended arm and vice versa) to parameters a and/or b affect the overall strength of attraction to in-phase and antiphase coordination (and, thus, coordinative stability), they do not induce a shift in relative phase away from those patterns (for an explicit account in this regard, see de Poel et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…The aim of the second experiment was to examine whether, apart from the amplitude disparity (Δ A ), asymmetrically focused attention has additional effects on the relative phase dynamics. This aim was motivated by the empirical observation that laterally focused attention affected the asymmetry in coupling strength (de Poel et al, 2008), which was formally related to modulations of parameter d in Equation 3 (de Poel et al, 2007; Peper, Daffertshofer, & Beek, 2004). Accordingly, it was predicted that for any given Δ A (i.e., provided that Δ A is equal across the attention conditions), asymmetrical attentional focus would result in additional shifts in relative phasing.…”

Section: Methodsmentioning

confidence: 99%

“…The extra cosine terms in Equation 1 were suggested to reflect an asymmetry in the coupling between the limbs, the strength of which was determined by parameter d (setting parameter c aside; Treffner & Turvey, 1995). Recently, this notion was elaborated by Peper, Daffertshofer, and Beek (2004), who demonstrated formally that a phase lead (induced by parameter d ) may indeed result from the lagging limb being more strongly influenced by the leading limb than vice versa. De Poel et al (2007) provided empirical support in favor of this conception by determining the relative contribution of each oscillating limb to a (transient) change in the relative phase pattern (e.g., in response to a brief mechanical perturbation of one of the limbs).…”

Section: Asymmetry In Interlimb Coupling Strengthmentioning

confidence: 99%

See 3 more Smart Citations

Disentangling the effects of attentional and amplitude asymmetries on relative phase dynamics.

Poel

Peper

Beek

2009

Journal of Experimental Psychology: Human Perception and Perfor

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Attentional asymmetry in rhythmic interlimb coordination induces an asymmetry in relative phase dynamics, allegedly reflecting an asymmetry in coupling strength. However, relative phase asymmetries may also be engendered by an attention-induced difference between the amplitudes (and hence the preferred frequencies) of the limb movements. The authors conducted 3 experiments to dissociate those (not mutually exclusive) potential effects. Controlled manipulations of amplitude disparity and attentional focus, both alone and combined, revealed that variations in amplitude disparity had the expected effects, but produced evidence against the currently prevailing interpretation that attentional asymmetry affects the relative phase dynamics through an asymmetry in coupling strength. Implications of these findings are discussed vis-à-vis recent empirical findings and extant dynamical models.

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Section: Methodssupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Asymmetry In Interlimb Coupling Strengthmentioning

confidence: 99%

See 2 more Smart Citations

Disentangling the effects of attentional and amplitude asymmetries on relative phase dynamics.

Poel

Peper

Beek

2009

Journal of Experimental Psychology: Human Perception and Perfor

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Coupling dynamics in speech gestures: amplitude and rate influences

Lieshout

2017

Exp Brain Res

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Speech is a complex oral motor function that involves multiple articulators that need to be coordinated in space and time at relatively high movement speeds. How this is accomplished remains an important and largely unresolved empirical question. From a coordination dynamics perspective, coordination involves the assembly of coordinative units that are characterized by inherently stable coupling patterns that act as attractor states for task-specific actions. In the motor control literature, one particular model formulated by Haken et al. (Biol Cybern 51(5):347-356, 1985) or HKB has received considerable attention in the way it can account for changes in the nature and stability of specific coordination patterns between limbs or between limbs and external stimuli. In this model (and related versions), movement amplitude is considered a critical factor in the formation of these patterns. Several studies have demonstrated its role for bimanual coordination and similar types of tasks, but for speech motor control such studies are lacking. The current study describes a systematic approach to evaluate the impact of movement amplitude and movement duration on coordination stability in the production of bilabial and tongue body gestures for specific vowel-consonant-vowel strings. The vowel combinations that were used induced a natural contrast in movement amplitude at three speaking rate conditions (slow, habitual, fast). Data were collected on ten young adults using electromagnetic articulography, recording movement data from lips and tongue with high temporal and spatial precision. The results showed that with small movement amplitudes there is a decrease in coordination stability, independent from movement duration. These findings were found to be robust across all individuals and are interpreted as further evidence that principles of coupling dynamics operate in the oral motor control system similar to other motor systems and can be explained in terms of coupling mechanisms between neural oscillators (organized in networks) and effector systems. The relevance of these findings for understanding motor control issues in people with speech disorders is discussed as well.

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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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Dynamical Models of Rhythmic Interlimb Coordination

Cited by 5 publications

References 80 publications

Disentangling the effects of attentional and amplitude asymmetries on relative phase dynamics.

Disentangling the effects of attentional and amplitude asymmetries on relative phase dynamics.

Coupling dynamics in speech gestures: amplitude and rate influences

Laterally focused attention modulates asymmetric coupling in rhythmic interlimb coordination

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