Corticospinal Beta-Range Coherence Is Highly Dependent on the Pre-stationary Motor State

摘要: During steady muscle contractions, the human sensorimotor cortex generates oscillations in beta-frequency range (15–30 Hz) that are coherent with activity of contralateral spinal motoneurons. This corticospinal coherence is thought to favor stationary motor states, but its mode operation remains elusive. We hypothesized beta-range depends on processing state before a force task and may thus increase after tuning dynamic generation. To test this hypothesis we instructed 16 subjects compensate static rest as well compensating predictable or unpredictable their right index finger. calculated EEG-EMG coherence, cortical spectral power, performance during conditions. Corticospinal beta-coherence was excessively elevated if steady-state contraction preceded by instead rest, highest force. The beta-power decreased from force, lowest showed significant negative correlation preceding change beta-power. did not entail an inferior results imply between computational load isometric engagement. suggest provides functional gateway for force-related can override states tuned modulation might ensure comparable precision various contexts.