title: Motor inhibition and response expectancy: a Laplacian ERP study.
abstract: In between-hand choice reaction time tasks, the motor cortex involved in the required response (contralateral) has been shown to be activated while the motor cortex involved in the non-required response (ipsilateral) has been shown to be inhibited. The aim of the present study was to test the hypothesis that ipsilateral inhibition reflects an active mechanism aimed at preventing errors. To this end, the risk of committing errors in between-hand choice reaction time tasks was manipulated by introducing a response probability bias. The surface Laplacian transforms of electroencephalographic waves recorded over the motor cortices, contralateral and ipsilateral to the responding hand were compared. Results showed that contralateral activation was not modulated by the risk of committing errors while ipsilateral inhibition was sensitive to this risk in a gradual manner: the higher the risk, the stronger the inhibition.
authors.affiliation: Institut de Médecine Navale du Service de Santé des Armées, Toulon, France.
authors.forename: Cédric
authors.initials: C
authors.lastname: Meckler
authors.forename: Sonia
authors.initials: S
authors.lastname: Allain
authors.forename: Laurence
authors.initials: L
authors.lastname: Carbonnell
authors.forename: Thierry
authors.initials: T
authors.lastname: Hasbroucq
authors.forename: Boris
authors.initials: B
authors.lastname: Burle
authors.forename: Franck
authors.initials: F
authors.lastname: Vidal
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D002755:Choice Behavior / Q000502:physiology; D004569:Electroencephalography / Q000379:methods; D004576:Electromyography / Q000379:methods; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology; D009433:Neural Inhibition / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology