Motor control and position sense: action-perception coupling.

摘要: According to previous studies, muscles become active in response deviations from a threshold (referent) position of body segments. To test the hypothesis that corticospinal pathways set and reset referent task-specific way, we evaluated influences at wrist positions established before after voluntary motion as well involuntary elicited by sudden removal load. Although tonic electromyogram (EMG) levels pre- post-unloading were different, thus remained same. These changed, however, when subjects voluntarily moved their wrists other position. Thus, control strategies underlying two types motor actions are fundamentally different. We also tested somatosensory afferents inform brain about deviation (P) segments centrally position, R. identify actual (Q) form sense (PS), central afferent signals combined. The PS rule was confirmed demonstrating that: able successfully reproduce changes unloading flexors making movements; elbow joint under different constant loads; may not be aware flexion tendon vibration until certain limit (no-motion illusion). In conclusion, R P additive components and, contrary conventional assumptions, is independent effort or efference copy.