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An event-related potential study on the time course of mental rotation in upper-limb amputees

Objective: Mental rotation of body parts involves sequential cognitive processes, including visual processing, categorization and the mental rotation process itself. However, how these processes are affected by the amputation of a limb is still unclear. Methods: Twenty-five right upper-limb amputees...

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Bibliographic Details
Main Authors: Lyu, Yuanyuan (Author) , Flor, Herta (Author)
Format: Article (Journal)
Language:English
Published: May 2017
In: Clinical neurophysiology
Year: 2017, Volume: 128, Issue: 5, Pages: 744-750
ISSN:1872-8952
DOI:10.1016/j.clinph.2017.02.008
Online Access:Verlag, Volltext: http://dx.doi.org/10.1016/j.clinph.2017.02.008
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S1388245717300639
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Author Notes:Yuanyuan Lyu, Xiaoli Guo, Robin Bekrater-Bodmann, Herta Flor, Shanbao Tong

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520 |a Objective: Mental rotation of body parts involves sequential cognitive processes, including visual processing, categorization and the mental rotation process itself. However, how these processes are affected by the amputation of a limb is still unclear. Methods: Twenty-five right upper-limb amputees and the same number of matched healthy controls participated in a hand mental rotation task. Thirty-two-channel electroencephalography (EEG) was recorded and the event-related potentials (ERPs) were analyzed. Results: In the early visual processing phase, amputees and controls showed a similar P100. During the categorization phase, the amputees exhibited a decreased N200 compared with controls, and the decline was positively correlated with the time since amputation. In the mental rotation phase, controls had a larger ERP for the right upright hand than for the left upright hand, while amputees had a larger ERP for the left (intact) upright hand than for the right (affected) upright hand. Conclusions: Early visual processing was not affected by limb amputation. However, the perceptual salience of hand pictures decreased and the intact hand gained more significance in the amputees. Significance: Event-related potentials had the capability of showing the differences in categorization and mental rotation phases between amputees and controls. 
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