Perturbation-Induced False Starts as a Test of the Jirsa–Kelso Excitator Model
Identifieur interne : 004191 ( Main/Merge ); précédent : 004190; suivant : 004192Perturbation-Induced False Starts as a Test of the Jirsa–Kelso Excitator Model
Auteurs : Philip W. Fink [Nouvelle-Zélande] ; J. A. Scott Kelso ; Viktor K. Jirsa [France]Source :
- Journal of Motor Behavior [ 0022-2895 ] ; 2009.
Abstract
One difference between the excitator model and other theoretical models of coordination is the mechanism of discrete movement initiation. In addition to an imperative signal common to all discrete movement initiation, the excitator model proposes that movements are initiated when a threshold element in state space, the so-called
Url:
DOI: 10.3200/JMBR.41.2.147-157
PubMed: 19201685
PubMed Central: 2637459
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PMC:2637459Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>One difference between the excitator model and other theoretical models of coordination is the mechanism of discrete movement initiation. In addition to an imperative signal common to all discrete movement initiation, the excitator model proposes that movements are initiated when a threshold element in state space, the so-called <italic>separatrix</italic>
, is crossed as a consequence of stimulation or random fluctuations. The existence of a separatrix predicts that false starts will be caused by mechanical perturbations and that they depend on the perturbation's direction. The authors tested this prediction in a reaction-time task to an auditory stimulus. Participants applied perturbations in the direction of motion (i.e., index finger flexion) or opposed to the motion prior to the stimulus on 1/4 of the trials. The authors found false starts in 34% and 9% of trials following flexion perturbations and extension perturbations, respectively, as compared with only 2% of trials without perturbations, confirming a unique prediction of the excitator model.</p>
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