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知觉质量对汉字心理旋转事件相关电位P300的影响
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作者：刘练红 王智斌 刘旭峰 苗丹民 王伟
【关键词】 心理旋转；,事件相关电位；,知觉质量；,潜伏期
Influence of perceptional quality of stimulus on eventrelated potential P300 during mental rotation
【Abstract】 AIM： To observe the effects of visual noise on the mental rotation. METHODS： The reaction time and eventrelated potentials (ERP) were recorded when 8 healthy male college students were tested by mental rotation task. Stimuli were white words on a black background without visual noise and white words on a gray background with visual noise. RESULTS： With the increase of the rotation angle from 0° to 180° the average amplitude of P300 in Pz changed from (13.3±2.6) μV to (10.8±1.9) μV. The average latency of P300 changed from (504±65) ms to (601±53) ms; there was significant difference in the latency (P<0.05). The average amplitude of P300 in Cz changed from (9.8±2.3) μV to (9.0±2.8) μV. The average latency of P300 changed from (561±52) ms to (614±56) ms; there was significant difference in the average latency (P<0.05). CONCLUSION： With the increase of rotation angle，the amplitude of P300 becomes more negative. The reduced perceptual quality delays the onset of the mental rotation, and the onset of the amplitude modulation of P300 was also delayed.
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