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Synchronous Sounds Enhance Visual Sensitivity without Reducing Target Uncertainty

机译：同步声音增强了视觉灵敏度，而不会降低目标的不确定性

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摘要

We examined the crossmodal effect of the presentation of a simultaneous sound on visual detection and discrimination sensitivity using the equivalent noise paradigm (Dosher and Lu, 1998). In each trial, a tilted Gabor patch was presented in either the first or second of two intervals embedded in dynamic 2D white noise with one of seven possible contrast levels. The results revealed that the sensitivity of participants' visual detection and discrimination performance were both enhanced by the presentation of a simultaneous sound, though only close to the noise level at which participants' target contrast thresholds started to increase with the increasing noise contrast. A further analysis of the psychometric function at this noise level revealed that the increase in sensitivity could not be explained by the reduction of participants' uncertainty regarding the onset time of the visual target. We suggest that this crossmodal facilitatory effect may be accounted for by perceptual enhancement elicited by a simultaneously-presented sound, and that the crossmodal facilitation was easier to observe when the visual system encountered a level of noise that happened to be close to the level of internal noise embedded within the system.
机译：我们使用等效的噪声范式检查了同时声音的呈现对视觉检测和辨别灵敏度的交叉模态影响（Dosher和Lu，1998）。在每个试验中，以动态间隔2D白噪声中嵌入的两个间隔的第一个或第二个间隔中的七个间隔中的一个呈现倾斜的Gabor色块。结果显示，通过同时发出声音，参与者的视觉检测和辨别性能都得到了增强，尽管只有接近噪声水平，参与者的目标对比度阈值才随着噪声对比度的增加而开始增加。在此噪声水平下对心理测量功能的进一步分析表明，灵敏度的提高无法通过减少参与者对视觉目标开始时间的不确定性来解释。我们建议，这种跨峰促进作用可能是由同时呈现的声音引起的知觉增强引起的，并且当视觉系统遇到的噪声水平恰好接近内部噪声水平时，跨峰促进更容易观察到系统中嵌入的噪音。

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