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DOI:	10.1371/journal.pone.0139988
论文题名:	Perceived Cost and Intrinsic Motor Variability Modulate the Speed-Accuracy Trade-Off
作者:	Matteo Bertucco; Nasir H. Bhanpuri; Terence D. Sanger
刊名:	PLOS ONE
ISSN:	1932-6203
出版年:	2015
发表日期:	2015-10-8
卷:	10, 期:10
语种:	英语
英文关键词:	Dystonia ; Child health ; Musculoskeletal system ; Behavior ; Motor system ; Cerebral palsy ; Ellipses ; Human mobility
英文摘要:	Fitts’ Law describes the speed-accuracy trade-off of human movements, and it is an elegant strategy that compensates for random and uncontrollable noise in the motor system. The control strategy during targeted movements may also take into account the rewards or costs of any outcomes that may occur. The aim of this study was to test the hypothesis that movement time in Fitts’ Law emerges not only from the accuracy constraints of the task, but also depends on the perceived cost of error for missing the targets. Subjects were asked to touch targets on an iPad® screen with different costs for missed targets. We manipulated the probability of error by comparing children with dystonia (who are characterized by increased intrinsic motor variability) to typically developing children. The results show a strong effect of the cost of error on the Fitts’ Law relationship characterized by an increase in movement time as cost increased. In addition, we observed a greater sensitivity to increased cost for children with dystonia, and this behavior appears to minimize the average cost. The findings support a proposed mathematical model that explains how movement time in a Fitts-like task is related to perceived risk.
URL:	http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0139988&type=printable
Citation statistics:
资源类型:	期刊论文
标识符:	http://119.78.100.158/handle/2HF3EXSE/22622
Appears in Collections:	过去全球变化的重建影响、适应和脆弱性科学计划与规划气候变化与战略全球变化的国际研究计划气候减缓与适应气候变化事实与影响

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File Name/ File Size	Content Type	Version	Access	License
journal.pone.0139988.PDF（1374KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	View Download

作者单位:

Department of Biomedical Engineering, University of Southern California, Los Angeles, California, United States of America;Department of Biomedical Engineering, University of Southern California, Los Angeles, California, United States of America;Departments of Biomedical Engineering, Child Neurology, and Biokinesiology, University of Southern California and Children’s Hospital of Los Angeles, Los Angeles, California, United States of America

Recommended Citation:

Matteo Bertucco,Nasir H. Bhanpuri,Terence D. Sanger. Perceived Cost and Intrinsic Motor Variability Modulate the Speed-Accuracy Trade-Off[J]. PLOS ONE,2015-01-01,10(10)

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