Distortions of the Efferent Copy during Force Perception: A Study of Force Drifts and Effects of Muscle Vibration
| Autor: | Jacob J. Corey, Mark L. Latash, Cristian Cuadra |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty Efferent media_common.quotation_subject Sensory system Vibration Fingers 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation Force matching Feedback Sensory Perception medicine Humans media_common Physics Finger force Muscle vibration Muscles General Neuroscience Stiffness 030104 developmental biology medicine.symptom Psychomotor Performance 030217 neurology & neurosurgery |
| Zdroj: | Neuroscience. 457:139-154 |
| ISSN: | 0306-4522 |
| Popis: | We used a finger force matching task to explore the role of efferent signals in force perception. Healthy, young participants performed accurate force production tasks at different force levels with the index and middle fingers of one hand (task-hand). They received visual feedback during an early part of each trial only. After the feedback was turned off, the force drifted toward lower magnitudes. After 5 s of the drift, the participants matched the force with the same finger pair of the other hand (match-hand). The match-hand consistently overshot the task-hand force by a magnitude invariant over the initial force levels. During force matching, both hands were lifted and lowered smoothly to estimate their referent coordinate (RC) and apparent stiffness values. These trials were performed without muscle vibration and under vibration applied to the finger/hand flexors or extensors of the task-hand or match-hand. Effects of vibration were seen in the match-hand only; they were the same during vibration of flexors and extensors. We interpret the vibration-induced effects as consequences of using distorted copies of the central commands to the task-hand during force matching. In particular, using distorted copies of the RC for the antagonist muscle group could account for the differences between the task-hand and match-hand. We conclude that efferent signals may be distorted before their participation in the perceptual process. Such distortions emerge spontaneously and may be amplified by the response of sensory endings to muscle vibration combined over both agonist and antagonist muscle groups. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect