Removal of visual feedback lowers structural variability of inter-digit force coordination during sustained precision pinch

NEUROSCIENCE LETTERS

卷:545

Article

Li, Ke ; Marquardt, Tamara L. ; Li, Zong-Ming

关键词: Sustained pinch;    Force variability;    Visual feedback;    Detrended fluctuation analysis (DFA);    Detrended cross-correlation analysis (DCCA);   

DOI  :  10.1016/j.neulet.2013.04.011

来源: Elsevier

【 摘 要 】

This study examined the effects of visual feedback on inter-digit force coordination during a precision pinch. Sixteen healthy, right-handed subjects were instructed to pinch an instrumented apparatus for 1 mm with a stable force output. Visual feedback was provided for the first 30s and withdrawn for the second 30s. Detrended fluctuation analysis (DFA) and detrended cross-correlation analysis (DCCA) methods were used to quantify the time-dependent structures of each digit's force and of the force correlation between the digits. After removing visual feedback, the DFA scaling exponent, alpha(DFA), increased from 1.10 +/- 0.12 to 1.29 +/- 0.13 for the thumb and from 0.95 +/- 0.08 to 1.33 +/- 0.13 for the index finger (F-1,F-95 =372.47, p < 0.001); the DCCA scaling exponent, alpha(DCCA), increased from 1.00 +/- 0.08 to 1.33 +/- 0.13 (t(95)=20.33, p < 0.001). Structural changes were observed beginning with the first 5s epoch after the removal of visual feedback. The results provide evidence that removing visual feedback lowers the structural variability of inter-digit force coordination. This change is reflected in the high-level control strategy, resulting in the two digits being more tightly coupled under somatosensory feedback without visual inputs. (C) 2013 Elsevier Ireland Ltd. All rights reserved.

【 授权许可】

Free