Role of Post-Trial Visual Feedback on Unintentional Force Drift During Isometric Finger Force Production Tasks

Author:

Balamurugan S.1,Dhanush Rachaveti2,Varadhan S.K.M.1

Affiliation:

1. 1Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, India

2. 2Department of Biomedical Engineering, Saveetha Engineering College, Chennai, India

Abstract

A reduction in fingertip forces during a visually occluded isometric task is called unintentional drift. In this study, unintentional drift was studied for two conditions, with and without “epilogue.” We define epilogue as the posttrial visual feedback in which the outcome of the just-concluded trial is shown before the start of the next trial. For this study, 14 healthy participants were recruited and were instructed to produce fingertip forces to match a target line at 15% maximum voluntary contraction. The results showed a significant reduction in unintentional drift in the epilogue condition. This reduction is probably due to the difference in the shift in λ, the threshold of the tonic stretch reflex, the hypothetical control variable that the central controller can set.

Publisher

Human Kinetics

Subject

Physiology (medical),Neurology (clinical),Physical Therapy, Sports Therapy and Rehabilitation

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