Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology · 2017
An event-related potential study on the time course of mental rotation in upper-limb amputees.
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Lyu Yuanyuan, Guo Xiaoli, Bekrater-Bodmann Robin, Flor Herta, Tong Shanbao
Аннотация
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.
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.