Different roles of alpha and beta band oscillations in anticipatory sensorimotor gating

摘要: Alpha (8-12Hz) and beta band (18-30Hz) oscillations have been implicated in sensory anticipation motor preparation. Here, using magneto-encephalography, we tested whether they distinct functional roles a saccade task that induces remapping between reference frames. With crossed hands posture, subjects had to as fast accurate possible toward tactile stimulus delivered one of two non-visible index fingers, located the left or right gaze. Previous studies shown this task, which somatotopic must be remapped activate oculomotor system opposing hemisphere, is occasionally preceded by intrahemispheric remapping, driving premature into wrong direction. To test brain could anticipate provided auditory predictive cues (80% validity), indicated finger most likely stimulated. Both frequency bands showed different lateralization profiles at central versus posterior sensors, indicating somatosensory processing. Furthermore, power cortex correlated positively with reaction time (SRT), correlation values were significantly higher contralateral ipsilateral activation. In contrast, alpha parietal negatively SRT, more negative than These results suggest activity: 1) gating oscillations, increasing excitability (positive correlation) 2) inhibiting gaze-centered regions involved generating direction (negative correlation). Our show low rhythms gate upcoming sensorimotor transformations.