6533b835fe1ef96bd129ff63
RESEARCH PRODUCT
Interhemispheric inhibition is dynamically regulated during action observation
Charalambos PapaxanthisYves BallayNicolas GueugneauNicolas GueugneauNicolas GueugneauMarco Bovesubject
0301 basic medicineMalemedicine.medical_treatmentcorpus-callosumPyramidal TractsCorticospinal excitabilitFunctional Laterality0302 clinical medicinehuman motor cortextranscallosal inhibitionInterhemispheric inhibitiontranscranial magnetic stimulationAction observation Corticospinal excitabilit; Interhemispheric inhibition Movement kinematics Transcranial magnetic stimulation Adult Evoked Potentials Motor Female Functional Laterality Hand Strength Humans Male Motor Cortex Movement Muscle Skeletal Pyramidal Tracts Rest Transcranial Magnetic Stimulation Young Adult Neuropsychology and Physiological Psychology Experimental and Cognitive Psychology Cognitive NeuroscienceEvoked Potentialsvoluntary movementHand StrengthMotor CortexAction observationSkeletalCorticospinal excitabilitymedicine.anatomical_structureNeuropsychology and Physiological PsychologyMotormultiple-sclerosiscortical areasMuscleFemalePsychologyMotor cortexAdultCognitive NeuroscienceMovementRestipsilateral silent periodExperimental and Cognitive PsychologyInhibitory postsynaptic potential03 medical and health sciencesYoung AdultMotor systemmedicineHumansMuscle SkeletalPyramidal tractsNeurophysiologyEvoked Potentials MotorTranscranial magnetic stimulation030104 developmental biologyAction (philosophy)[ SDV.NEU ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]Silent periodMovement kinematicsNeuroscienceintracortical circuits030217 neurology & neurosurgerydescription
International audience; It is now well established that the motor system plays a pivotal role in action observation and that the neurophysiological processes underlying perception and action overlaps. However, while various experiments have shown a specific facilitation of the contralateral motor cortex during action observation, no information is available concerning the dynamics of interhemispheric interactions. The aim of the present study was, therefore, to assess interhemispheric inhibition during the observation of others' actions. We designed a transcranial magnetic stimulation (TMS) experiment in which we measured both corticospinal excitability and interhemispheric inhibition, this latter by means of the ipsilateral silent period (iSP), while participants observed two motor tasks (tapping or grasping). We show that the iSP is enhanced during movement observation and that this modulation is tuned to the kinematics of the observed movements. An additional experiment was performed in which the TMS intensity was adjusted to match corticospinal excitability between rest and action observation. This resulted in a relative decrease of iSP. Overall, our data strongly suggest that action observation, as action execution, involves interhemispheric inhibitory mechanisms between the two motor cortices, and that this neural activity appears to be firmly shaped by the ongoing observed movement and its intrinsic dynamics. (C) 2016 Elsevier Ltd. All rights reserved.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-05-01 |