Deterministic variability and stability in detuned bimanual rhythmic coordination

Riley, Michael A.; Santana, Marie-Vee; Turvey, M. T.

doi:10.1016/s0167-9457(01)00051-3

Cited by 21 publications

(25 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The conclusion to be drawn is that minimal variability of phasing occurs at an optimal or ''comfort mode'' frequency (Kugler & Turvey, 1987;Kugler et al, 1980), and that this frequency corresponds to the cardinal attractors of the fully asymmetric HKB equation with phase-offset (i.e., at / ¼ 0°and 180°, with D/ ¼ 0). Of particular relevance to the current model are recent developments in understanding the role of variability in bimanual coordination Collins & Turvey, 1999;Riley et al, 1997;Riley & Turvey, 2002;Riley, Santana, & Turvey, 2001;Zanone et al, 2001), goal-directed perceptual-motor coordination (Treffner, Barrett, & Petersen, 2002;Treffner & Kelso, 1999), and communication (Shockley, Santana, & Fowler, 2001). We believe that, in large part, further understanding of the dynamical signatures of biological systems will come from continued investigation into how intentional and attentional factors interact to give rise to patterns of variability.…”

Section: Attention and Decreased Variabilitymentioning

confidence: 95%

Intentional and attentional dynamics of speech–hand coordination

Treffner

Peter

2002

Human Movement Science

View full text Add to dashboard Cite

Interest is rapidly growing in the hypothesis that natural language emerged from a more primitive set of linguistic acts based primarily on manual activity and hand gestures. Increasingly, researchers are investigating how hemispheric asymmetries are related to attentional and manual asymmetries (i.e., handedness). Both speech perception and production have origins in the dynamical generative movements of the vocal tract known as articulatory gestures. Thus, the notion of a ''gesture'' can be extended to both hand movements and speech articulation. The generative actions of the hands and vocal tract can therefore provide a basis for the (direct) perception of linguistic acts. Such gestures are best described using the methods of dynamical systems analysis since both perception and production can be described using the same commensurate language. Experiments were conducted using a phase transition paradigm to examine the coordination of speech-hand gestures in both left-and right-handed individuals. Results address coordination (in-phase vs. anti-phase), hand (left vs. right), lateralization (left vs. right hemisphere), focus of attention (speech vs. tapping), and how dynamical constraints provide a foundation for human communicative acts. Predictions from the asymmetric HKB equation confirm the attentional basis of functional asymmetry. Of significance is a new understanding of the role of perceived synchrony (p-centres) during intentional cases of gestural coordination.

show abstract

Section: Attention and Decreased Variabilitymentioning

confidence: 95%

Intentional and attentional dynamics of speech–hand coordination

Treffner

Peter

2002

Human Movement Science

View full text Add to dashboard Cite

show abstract

“…Court et al 2002;Amazeen et al 1996), and may result from a change in the quality or magnitude of perturbations affecting system stability. For instance, research by Riley et al (2001), which examined the effects of ω = 0 on system variability, suggests that changes in SDφ that result when movement frequency is changed are due to fluctuations that arise from the non-harmonic dynamics of component limbs. More recently, work by Pellecchia et al (2005) and Shockley and Turvey (2005) suggests that the increases in SDφ that occur when a cognitive task is performed concurrently with interlimb coordination are the result of a magnification of noise rather than a change in λ.…”

Section: The Stability and Variability Of Interlimb Coordinationmentioning

confidence: 99%

“…The idea that differences in the eigen- frequencies of coupled oscillators influences the magnitude internal fluctuations or perturbations, in addition to changing the strength and location of the underlying relative phase attractors has been suggested (and debated) previously (e.g. Fuchs and Kelso 1994;Riley et al 2001). Most recent is the work by Riley et al (2001), where the authors argue that when ω = 0 differences exist in the non-harmonic dynamics of component oscillators (e.g.…”

Section: Frequencymentioning

confidence: 99%

“…Fuchs and Kelso 1994;Riley et al 2001). Most recent is the work by Riley et al (2001), where the authors argue that when ω = 0 differences exist in the non-harmonic dynamics of component oscillators (e.g. high-frequency relaxation oscillators compared to low-frequency harmonic oscillators) and cause a deterministic fluctuation process to emerge-which in turn, causes an increase in the variability of interlimb coordination.…”

Section: Frequencymentioning

confidence: 99%

“…high-frequency relaxation oscillators compared to low-frequency harmonic oscillators) and cause a deterministic fluctuation process to emerge-which in turn, causes an increase in the variability of interlimb coordination. This noise or fluctuation process is argued to be deterministic (Riley et al 2001), rather than stochastic, as it emerges from a parametric change in the collective dynamics of interlimb coordination and, moreover, operates at a time scale relatively close to that of the collective dynamic (the perturbations or noise that emerges when ω = 0 occur at the level of the oscillators' limit-cycle dynamics).…”

Section: Frequencymentioning

confidence: 99%

See 2 more Smart Citations

Distinguishing the noise and attractor strength of coordinated limb movements using recurrence analysis

2006

View full text Add to dashboard Cite

The variability of coupled rhythmic limb movements is assumed to be a consequence of the strength of a movement's attractor dynamic and a constant stochastic noise process that continuously perturbs the movement system away from this dynamic. Recently, it has been suggested that the nonlinear technique of recurrence analysis can be used to index the effects of noise and attractor strength on movement variability. To test this, three experiments were conducted in which the attractor strength of bimanual wrist-pendulum movements (using coordination mode, movement frequency and detuning), as well as the magnitude of stochastic perturbations affecting the variability of these movements (using a temporally fluctuating visual metronome) was manipulated. The results of these experiments demonstrate that recurrence analysis can index parametric changes in the attractor strength of coupled rhythmic limb movements and the magnitude of metronome induced stochastic perturbations independently. The results of Experiments 1 and 2 also support the claim that differences between the variability of inphase and antiphase coordination, and between slow and fast movement frequencies are due to differences in attractor strength. In contrast to the standard assumption that the noise that characterizes interlimb coordination remains constant for different magnitudes of detuning (Delta omega) the results of Experiment 3 suggest that the magnitude of noise increases with increases in |Delta omega|.

show abstract

Surgical outcome of T4a and resected T4b oral cavity cancer

Liao

Chang

Wang

et al. 2006

Cancer

134

100

View full text Add to dashboard Cite

BACKGROUND.The American Joint Committee on Cancer (AJCC) 2002 staging system (AJCC 2002) suggested that squamous cell carcinoma of the oral cavity (OSCC) with T4b is unresectable. The current retrospective results show that selected T4b patients were resectable with favorable outcomes.METHODS.From January 1996 to December 2000, 103 consecutive untreated T4 OSCC patients (reclassified by AJCC 2002) without carotid artery encasement and skull base extension were eligible for radical treatment. All received head‐and‐neck magnetic resonance imaging (MRI) and/or computed tomography (CT) scans before operation. The surgical principles were safety margins of ≥1 cm for primary tumors, modified/radical neck dissections for clinical lymph node‐positive disease, and supraomohyoid neck dissection for lymph node‐negative disease. In all, 95.1% of patients (98 of 103 patients) underwent free‐flap reconstructions. Adjuvant radiotherapy or concomitant chemoradiotherapy was administed to those with pathological T4 (AJCC 1997), cervical lymph node metastasis, or close margins (≤4 mm). Survivals were calculated according to the method of Kaplan and Meier.RESULTS.In all, 58 patients were classified as having T4a disease and 45 were classified as having T4b disease. No statistical difference was observed in the 5‐year local control, neck control, disease‐free survival, and overall survival rates between the T4a and T4b groups. In multivariate analyses, pathologic lymph node status (pN0‐1 vs. pN2) was found to be the sole independent predictor for T4b for local control (P = .012), disease‐free survival (P = .005), and overall survival (P = .008).CONCLUSIONS.Selected T4b OSCC patients were found to be resectable with outcomes that were comparable to those of T4a OSCC patients and may benefit from radical surgery, free‐flap reconstruction, and adjuvant therapy. A pathologic lymph node status of ≥2 was found to be the sole independent predictor for T4b disease in local control and survival. Cancer 2006. © 2006 American Cancer Society.

show abstract

Deterministic variability and stability in detuned bimanual rhythmic coordination

Cited by 21 publications

References 23 publications

Intentional and attentional dynamics of speech–hand coordination

Intentional and attentional dynamics of speech–hand coordination

Distinguishing the noise and attractor strength of coordinated limb movements using recurrence analysis

Surgical outcome of T4a and resected T4b oral cavity cancer

Contact Info

Product

Resources

About