Titre :

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

Auteur(s) :

Bonnet, Cédrick T. [Auteur]
Laboratoire de Neurosciences Fonctionnelles et Pathologies [LNFP]
Kinsella-Shaw, Jeffrey M [Auteur]
Frank, Till D [Auteur]
Bubela, Deborah J [Auteur]
Harrison, Steven J [Auteur]
Turvey, M T [Auteur]

Titre de la revue :

Journal of motor behavior

Nom court de la revue :

J Mot Behav

Numéro :

42

Pagination :

85-97

Date de publication :

2010

ISSN :

1940-1027

Mot(s)-clé(s) en anglais :

Age Factors
Aged
Analysis of Variance
Attention
Contrast Sensitivity
Environment
Fixation
Ocular
Humans
Models
Biological
Postural Balance
Posture
Reading
Stochastic Processes
Task Performance and Analysis
Visual Perception
Young Adult

Discipline(s) HAL :

Sciences cognitives

Résumé en anglais : [en]

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 ...
Lire la suite >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.Lire moins >

Langue :

Anglais

Audience :

Non spécifiée

Collections :

• Autres travaux scientifiques

Date de dépôt :

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