不同旋转速度背景及认知负荷对视认知早期加工的影响

目的研究不同转速旋转背景条件下,完成不同认知负荷视觉认知任务过程中的视认知早期加工的变化。方法受试者为20名健康右利手大学生,视觉背景分为白色背景与不同转速的模拟星空背景。要求受试者完成不反应、选择区分和选择心算任务,同时记录12导脑电数据。结果各种负荷任务中中央区的P1潜伏期最短,峰值波幅最高;与白色背景相比,各种速度旋转背景下,反应时及P1潜伏期缩短;与白色背景相比,不同旋转背景下完成选择区分及选择心算任务的P1峰值波幅升高。结论不同速度星空旋转背景加速了视觉认知的感知,在高负荷任务下增加启动效应。星空旋转不同角速度主要对区分反应的主动抑制加工过程产生影响。

Effects of Different Rotating Speed Backgrounds and Cognitive Loads on Visual Early Cognitive Processing

Objective To study the changes of visual early cognitive processing under visual rotating backgrounds at different speeds when performing different loads of visual tasks.Methods Twenty healthy righthanded university students participated in the experiment.The visual backgrounds were the normal white background and the simulated star background with different rotating speeds.The subjects were asked to perform no-response,selective switch response and selective mental arithmetic tasks and the 12-lead electroencephalogram(EEG) was recorded.Results It was found that the central area had the shortest P1 latencies and the highest P1 peak amplitudes.As compared with tasks performed under white background,the response time and P1 latencies were shortened under rotating background.As compared with tasks performed under white background,the response time and the peak amplitudes of the P1 were increased in selective switch response and selective mental arithmetic tasks under the rotating background.Conclusion Rotating backgrounds accelerated the perception of the visual cognition and increased the priming effect in high load task.Different angular velocities of the rotating background only affected the processing of active inhibition in the selective switch response task.