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Contrast dependence of lambda response

机译:λ反应的对比度依赖性

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Lambda response is obtained by averaging EEGs time-locked to the offset of saccadic eye movements (saccades) with a peak latency of about 100 ms from the offset of saccades. Lambda response is thought to be evoked by the inflow of visual information after the termination of the saccade. The purpose of the present study is to evaluate the effect of stimulus contrast on lambda response. Eighteen normal adults participated in the experiment. The stimuli were vertical black-and-white sinusoidal gratings of three spatial frequencies (0.5, 1 and 3 cycles/degree, cpd). Stimulus contrast ranged from 0% to 96%. The subject made horizontal saccades between two fixation points at a constant pace. At spatial frequencies of 0.5 and 1 cpd, the peak latency of lambda response decreased as the stimulus contrast increased. At spatial frequency of 3 cpd, the peak latency did not vary with die stimulus contrast. The peak amplitude of lambda response did not vary with the stimulus contrast at spatial frequencies of 0.5 and 1 cpd, but it did at spatial frequency of 3 cpd. These results indicate that the effect of stimulus contrast on lambda response changes according to the stimulus spatial frequency. They also suggest that lambda response may be a useful index of visual information processing with eye movements.
机译:通过平均截至扫视眼球运动(扫视)的偏移量来获得Lambda响应,从横向横向延迟约100ms的峰值等待时间。在扫视终止后,被认为被认为被视觉信息的流入所唤起的λ响应。本研究的目的是评估刺激对比对λ反应的影响。十八个普通成年人参加了实验。刺激是三个空间频率的垂直黑白正弦光栅(0.5,1和3个循环/度,CPD)。刺激对比度范围为0%至96%。主题以恒定的速度在两个固定点之间进行水平扫描。在0.5和1 CPD的空间频率下,随着刺激对比度的增加,Lambda响应的峰值延迟降低。在3 CPD的空间频率下,峰值延迟没有因对比度而变化。 Lambda响应的峰值幅度没有随着0.5和1 CPD的空间频率的刺激对比度而变化,但它在3 CPD的空间频率下确实。这些结果表明,刺激对比度对λ响应的影响根据刺激空间频率。他们还建议Lambda响应可以是眼球运动的可视信息处理的有用指标。

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