Deterministic and stochastic postural ...
Document type :
Article dans une revue scientifique
PMID :
Permalink :
Title :
Deterministic and stochastic postural processes: effects of task, environment, and age.
Author(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]

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]
Journal title :
Journal of motor behavior
Abbreviated title :
J Mot Behav
Volume number :
42
Pages :
85-97
Publication date :
2010
ISSN :
1940-1027
English keyword(s) :
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
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
HAL domain(s) :
Sciences cognitives
English abstract : [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 ...
Show more >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.Show less >
Show more >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.Show less >
Language :
Anglais
Audience :
Non spécifiée
Collections :
Submission date :
2019-06-05T18:25:43Z
2019-06-18T14:20:14Z
2019-06-18T14:23:18Z
2019-07-02T13:17:02Z
2021-09-08T15:56:45Z
2021-09-24T07:35:44Z
2022-01-15T15:00:49Z
2022-01-24T16:32:08Z
2019-06-18T14:20:14Z
2019-06-18T14:23:18Z
2019-07-02T13:17:02Z
2021-09-08T15:56:45Z
2021-09-24T07:35:44Z
2022-01-15T15:00:49Z
2022-01-24T16:32:08Z
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