La construction du schéma corporel chez l'enfant et l'adolescent

Size: px

Start display at page:

Download "La construction du schéma corporel chez l'enfant et l'adolescent"

Adele Mills
6 years ago
Views:

1 La construction du schéma corporel chez l'enfant et l'adolescent C. ASSAIANTE (1), F. CIGNETTI (1), A. FONTAN (1), B. NAZARIAN (2), J.L. ANTON (2), M. VAUGOYEAU (1) (1) Aix-Marseille Université, CNRS, LNC UMR 7291, Marseille, France (2) Aix-Marseille Université, CNRS, INT UMR 7289, Centre IRM Fonctionnelle Cérébrale, Marseille, France

2 Le schéma corporel Pour percevoir et agir dans son environnement, le corps, les caractéristiques de l action et leurs interactions sont représentés dans le cerveau. Cette représentation interne des segments corporels en mouvement a été conceptualisée sous le terme de schéma corporel (Head and Holmes, 1911; Maravita et al, 2003; Dijkerman and de Haan, 2007). La fonction principale du schéma corporel est de permettre l exécution de ses propres actions, mais le schéma corporel contribue également à comprendre une action exécutée par un autre et ainsi à comprendre les interactions sociales grâce au lien fonctionnel entre la perception et l action (Rizzzolatti et al, 2001; 2002; Miall, 2003; Centelles et al, 2011).

3 body schema from a neurosensory approach Paillard 1982 : «identified body and situated body» Proske and Gandevia, 2012 The proprioceptive senses «identified body» visual informations «situated body» proprioceptive informations Lopez et al., 2012 : Contribution of vestibular informations body schema is dependant on ongoing sensory inputs (proprioceptive, visual and vestibular), operates largely unconsciously and is concerned with body movements. 3

4 DEVELOPMENT OF PROPRIOCEPTIVE ABILITY Goble et al. (2005) Hum Movement Sci

5 DEVELOPMENT OF PROPRIOCEPTIVE ABILITY Proprioceptive acuity improves with age, as evaluated both from absolute errors and trialto-trial error variability Goble et al. (2005) Hum Movement Sci Yeh, Holst-Wolf, Konczak (2014) Poster Neuroscience, Washington

6 DEVELOPMENT OF PROPRIOCEPTIVE ABILITY Proprioceptive integration for postural control slowly improves during childhood and adolescence 5/6 7/10 11/13 14/15 5/6 7/10 11/13 14/15 5/6 7/10 11/13 14/15 5/6 7/10 Adults 11/13 14/15 5/6 7/10 11/13 14/15 Vaugoyeau et al. (2008) Gait Posture Mallau et al. (2010) PLoS One

7 Behavioral study *Cignetti et al J Mot Learn Dev ADU [20-40 y] N=12; 6-6 ADO [14-18 y] N=13; 5-8 preado [11-14 y[ N=14; 8-6 1/ Quantify postural adjustments evoked through tendon vibration in standing position Analysis of the displacement of the center of pressure and of the trunk rotation 2/ Quantify the illusory movement induced by vibration in sitting position Analysis of the displacement of the right finger index movement that had to match illusory movement of the feet

8 Behavioral study *Cignetti et al J Mot Learn Dev Exaggerated responses in ADO Proprioceptive ability continue to improve throughout adolescence

9 CENTRAL PROPRIOCEPTIVE PROCESSING Goble et al. (2011) J Neurosci Goble et al. (2012) Hum Brain Mapp

10 EXPERIMENTAL PROTOCOL Illusions? Pre-scanning Scanning ( 5) Vibration of TA tendon left, right, 30 Hz, 100 Hz Age: n = s rand. REST 12s ISI 12s REST 12s ISI ~ 5min / session (113 scans)

11 METHODS fmri time series (motion correction, spatial normalization, smoothing) Standard GLM Voxel time course Fitting (ML estimator)

12 PROPRIOCEPTIVE NETWORK IN ADULTS p < uncorr. p<0.05 FWE-corr. Right stim. Left stim. IPL IFG p < uncorr. Right-hemisphere dominance Cignetti et al Hum Brain Mapp

13 DEVELOPMENTAL CHANGES preado ADO ADU IPL IFG Right-hemisphere dominance Proprioceptive network looks already mature in pre-adolescents using a standard GLM approach Work in progress

14 METHODS Beta Series GLM Each predictor was replaced with a series of predictors i.e. after fitting, a series of betas Correlated the seed beta series with the beta series at every other voxel of the brain Rissman et al NeuroImage

from diffuse to more focal, or a fine-tuning of the

15 DEVELOPMENTAL CHANGES IN CONNECTIVITY MAPS preado ADO ADU Shift in pattern of functional connectivity from diffuse to more focal, or a fine-tuning of the proprioceptive connectivity network. Work in progress

16 DEVELOPMENTAL CHANGES preado 100Hz preado 30Hz ADO 100Hz ADO 30Hz ADU 100Hz ADU 30Hz Initial over-connectivity Proprioceptive followed network by looks a weakening already mature coupling pre-adolescents with several brain using regions, a standard that is GLM a kind approach of pruning at the system level. Work in progress

17 DEVELOPMENTAL CHANGES Univ. Shared Beta PreADO ADO ADU Work in progress

18 DEVELOPMENTAL VARIABILITY What it means for a region to be correlated with the seed while failing to show significant univariate activity? Firing of the neurons may not be enough to drive the BOLD signal above threshold on average, due to poor neural activity on some trials. Larger trial-to-trial variability in the amount of proprioceptiveinduced neural activity in pre-adolescents and adolescents, i.e. a suboptimal network functioning. Work in progress

19 Neuroimaging study CHILDREN [7-10 y] N=18; 11-7

20 DEVELOPMENTAL CHANGES IN ACTIVATION MAPS The proprioceptive network looks already mature in children using a standard GLM approach.

21 CHILDREN VERSUS ADULTS Significant larger extent of activation in children compared to ADU Significant stronger SMA activity in children compared to ADU

22 No Right hemispheric dominance in children IPL IFG Right-hemisphere dominance Right hemispheric dominance in adolescents and adults

fmri (connectivity maps) - DTI (white matter tracts) Correlation between fmri and DTI data and

23 WORK STILL IN PROGRESS 18 Children already scanned; Slightly increase the sample size. Comparative analysis between children and adolescents and adults - fmri (activation maps) - fmri (connectivity maps) - DTI (white matter tracts) Correlation between fmri and DTI data and behavioral indices about proprioceptive acuity and postural control Position matching tasks and postural task

Body Schema Disturbance in Adolescence: From Proprioceptive Integration to the Perception of Human Movement

Journal of Motor Learning and Development, 2013, 1, 49-58 2013 Human Kinetics, Inc. www.jmld-journal.com ORIGINAL RESEARCH Body Schema Disturbance in Adolescence: From Proprioceptive Integration to the