Deterministic and stochastic postural processes: effects of task, environment, and age.

Cédrick T. Bonnet 1 Jeffrey M Kinsella-Shaw Till D Frank Deborah J Bubela Steven J Harrison M T Turvey
1 LNFP - Laboratoire de Neurosciences Fonctionnelles et Pathologies
Abstract : Upright standing is always environmentally embedded and typically co-occurs with another (suprapostural) activity. In the present study, the authors investigate how these facts affect postural dynamics in an experiment in which younger (M age = 20.23 years, SD = 2.02 years) and older (M age = 75.26 years, SD = 4.87 years) participants performed a task of detecting letters in text or maintaining gaze within a target while standing upright in a structured or nonstructured stationary environment. They extracted the coefficients of drift (indexing attractor strength) and diffusion (indexing noise strength) from the center of pressure (COP) time series in anteroposterior (AP) and mediolateral (ML) axes. COP standard deviation decreased with drift and increased with diffusion. The authors found that structure reduced AP diffusion for both groups and that letter detection reduced younger SDAP (primarily by diffusion decrease) and increased older SDML (primarily by drift decrease). For older and younger participants, ML drift was lower during letter detection. Further, in older letter detection, larger visual contrast sensitivity was associated with larger ML drift and smaller SDML, raising the hypotheses that ML sway helps information detection and reflects neurophysiological age.
Keywords : Models Young Adult Visual Perception Task Performance and Analysis Stochastic Processes Postural Balance Biological Posture Reading Age Factors Aged Analysis of Variance Attention Contrast Sensitivity Environment Fixation Ocular Humans
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Soumis le : mardi 2 juillet 2019 - 15:17:59
Dernière modification le : mercredi 3 juillet 2019 - 01:11:27

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Cédrick T. Bonnet, Jeffrey M Kinsella-Shaw, Till D Frank, Deborah J Bubela, Steven J Harrison, et al.. Deterministic and stochastic postural processes: effects of task, environment, and age.. Journal of Motor Behavior, Taylor & Francis (Routledge), 2010, Journal of motor behavior, 42, pp.85-97. ⟨10.1080/00222890903498521⟩. ⟨hal-02159323⟩

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