Effect of noise on the contrast detection threshold in visual perception
Effect of noise on the contrast detection threshold in visual perception
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DOI：
10.1016/j.neulet.2006.08.054
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发表时间：
2006-11-13
影响因子：
2.5
通讯作者：
Aoki, Ryozo
中科院分区：
文献类型：
--
作者：
Sasaki, Hitoshi;Todorokihara, Masayoshi;Aoki, Ryozo
最近的研究表明，噪声可以改善多种感官模式中刺激的检测。我们在此研究是否可以通过添加一定量的噪声来提高视觉对比度检测灵敏度。在 22 名正常参与者中测量了周期性变化的光的对比度检测阈值（有或没有重叠噪声）。使用 1 或 15 Hz 的正弦调制光作为信号。白噪声用于产生随机闪烁的光作为噪声。参与者需要检测有或没有噪声的信号亮度的任何变化。使用心理物理学方法测量的对比度检测阈值在噪声强度阈值水平附近下降。噪声强度为 5 dB 时获得最大促进效果。无论信号频率如何（1 和 15 Hz），这种效应都能被一致地观察到。这些发现表明噪声可以改善人类视觉感知中的信号检测。 (c) 2006 Elsevier Ireland Ltd. 保留所有权利。
It has recently been shown that noise can improve the detection of stimuli in several sensory modalities. We herein investigated whether visual contrast detection sensitivity can be improved by adding a certain amount of noise. The contrast detection thresholds of a light changing brightness periodically were measured either with or without overlapping noise in 22 normal participants. Sinusoidal modulating light at 1 or 15 Hz was used as a signal. White noise was used to produce random flickering light as the noise. Participants were required to detect any changes in the brightness of the signal with or without noise. The contrast detection threshold, which was measured using a psychophysical method, decreased at around the threshold level of the noise intensity. The maximum facilitatory effect was obtained at a noise intensity of 5 dB. This effect was consistently observed regardless of the frequency of the signal (1 and 15 Hz). These findings indicate that noise can improve the signal detection in human visual perception. (c) 2006 Elsevier Ireland Ltd. All rights reserved.