Barral, J.

Debû, B.

Deiber, M.-P.

Hauert, C.-A.

Palix, J.

Serveur académique lausannois

INTRODUCTIONSuccessfully performing a bimanual task requires the simultaneous activation of homologous and/or non-homologous muscles of the two limbs. To avoid interference between the two motor commands, selective motor inhibition mechanisms are necessary. The aim of this study is to identify the cortical areas involved in these mechanisms.Electro-cortical correlates of bimanual coordination in adults : motor inhibition in a selective stop taskJérôme Barral1,2, Julie Palix2, Marie-Pierre Deiber3, Bettina Debû4 & Claude-Alain Hauert21 Institut des Sciences du Sport et de l’Education Physique, Université de Lausanne2 Laboratoire du Développement et des Apprentissages Moteurs, Faculté de Psychologie et des Sciences de l’Education, Université de Genève.3 Radiopharmaceutiques Biocliniques, Inserm U877, Faculté de Médecine, Université J. Fourier, Grenoble4 Laboratoire de Neurosciences Précliniques, U318 INSERM, Université J. Fourier, GrenobleSynchronisation Key3 Pairs of interest (POI):- left central to right central (C3-C4)- left central to anterior mid (C3-Cz)- right central to anterior mid (C4-Cz)4 regions of interest (ROI):- left central (C3 + CP3) : ROI 1- right central (C4 + CP4) : ROI 2- anterior midline (Cz + FCz) : ROI 3- posterior midline (Pz + CPz) :ROI 4• Indexes tapping / switching from bimanual to unimanual• Tempo of the auditory metronone = 700 ms ( ̴ 1.4 Hz).• 9 right-handed adults (4 women) aged from 24 to 38 years.• 4 experimental conditions of switching (each : 2 x 24 trials) • Rest condition• EEG from 64 surface electrodes (NeuroScan Inc.)• VD = Task-Related Power (TRPow) & Task-RelatedCoherence (TRCoh)• Two epochs of the EEG signal were compared (the transition stage versus the preceding  bimanual pattern)Left RightROI 1 : C3 + CP3 ROI 4 : CPz + PzROI 1ROI 4DISCUSSIONThese results provide an electrocortical correlate to recent EEG and fMRI findings suggesting the involvement of the posterior parietal cortex in motor transitions either to enable the change of motor program (Deiber et al., 2001) and/or for resisting to motor interferences between the two limbs (Wenderoth et al., 2005). In addition, they suggest that selective motor inhibition manifests itself as changes in the functional coupling between lateral and mesial cortical areas.3 / TRCoh2 / TRPow-1,0-0,8-0,6-0,4-0,20,00,2 INPHASESTOPRightSTOPLeft-1,0-0,8-0,6-0,4-0,20,00,2 INPHASESTOPRightSTOPLeftPROCEDURE AND METHODSIn the alpha band (8 – 12 Hz) :• The transition from in-phase to right hand stop shows significant increase in ROI 1, (F(1, 8) = 17.34, p < .01) only.• The transition from in-phase to left hand stop shows significant increase in ROI 1, (F(1, 8) = 14.65, p < .01) and ROI 4, (F(1, 8) = 15.71, p < .01).• The transitions from anti-phase pattern do not yield significant changes, whatever the ROI.In the beta band (13 – 30 Hz), when switching from both bimanual patterns to unimanual right hand movements, TRCoh decreases during the transition stage for C4-Cz (in-phase, F(1, 8) = 14.74, p < .01; anti-phase, F(1, 8) = 11.47, p < .01) but not for C3-Cz. The pattern of results is reversed when switching to the left hand, although not statistically significant.STATISTICAL ANALYSISUsing ANOVA, we opted for specific contrasts to test our hypotheses. Five contrasts were performed on EEG data, with a corrected significant threshold of p = .01.REFERENCESDeiber, M.-P., Caldara, R., Ibañez, V. & Hauert, C.-A. (2001).Alpha band power changes in unimanual and bimanual sequential movements and during motor transitions. Clinical Neurophysiology, 112, 1419-1435.Wenderoth, N., Debaere, F., Sunaert, S. & Swinnen, S. P. (2005). The role of anterior cingulate cortex and precuneus in the coordination of motor behaviour. European Journal of Neuroscience, 22, 235-246.Contact:jerome.barral@unil.chRESULTS1 / behavioral performanceWhatever the condition of switching, the stability of the first unimanual tapping, immediately following the transition, is significantly perturbed.C3 Cz C4Ð Ð Ð ÐÐ Ï Ð ÐororIN PHASEANTI PHASESTOP Right STOP LeftSTOP Right STOP LeftGrand average of the TRPow values (n = 9). Maps correspond to transitional state from in-phase bimanual to unimanual movements. TRPow decreases (area of `activation', negative TRPow values) are coded in blue and TRPow increases (positive TRPow values) are coded in red.

Electro-cortical correlates of bimanual coordination in adults: motor inhibition in a selective stop task

https://serval.unil.ch/resource/serval:BIB_7CF435CFEB26.P001/REF.pdf

Electro-cortical correlates of bimanual coordination in adults: motor inhibition in a selective stop task

Abstract

Similar works

Full text

Available Versions

Serveur académique lausannois