The modulation of background color on perceiving audiovisual simultaneity
The modulation of background color on perceiving audiovisual simultaneity
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DOI：
10.1016/j.visres.2020.04.009
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发表时间：
2020-07-01
期刊：
影响因子：
1.8
通讯作者：
Yeh, Su-Ling
中科院分区：
文献类型：
--
作者：
Chien, Sung-En;Chen, Yi-Chuan;Yeh, Su-Ling
感知的一致性是整合视觉和听觉信号的关键，从而产生统一的感知。我们研究了背景颜色是否会调节人们对视听连续性的感知。提出并检验了两个假设：（1）红色损伤假设：当观看红色背景时，视觉处理速度恶化，因为大细胞系统被红光抑制;和（2）蓝色增强假设：当观看蓝色背景时，视觉和听觉信号的检测都得到增强，因为它刺激蓝光敏感的固有光敏视网膜神经节细胞（ipRGC），这会触发更高的警戒状态参与者暴露于不同的背景，同时执行视听一致性判断（SJ）的任务：闪光灯和蜂鸣声呈现在预先指定的刺激起始时间（SOA）和参与者判断是否两个刺激同时呈现。实验1表明，当闪光出现在周边时，与蓝色背景相比，红色背景中的主观不确定性点（PSS）向视觉主导条件移动。在实验2中，专门操纵ipRGC的刺激以测试蓝色增强假说。结果表明，不支持这一假设，也许是由于自上而下的皮层调制。两者合计，在红色背景下的PSS向视觉领先的条件的转变是由于受损的视觉处理速度相对于听觉处理速度，在红光下的大细胞系统的抑制所造成的。
Perceiving simultaneity is critical in integrating visual and auditory signals that give rise to a unified perception. We examined whether background color modulates people's perception of audiovisual simultaneity. Two hypotheses were proposed and examined: (1) the red-impairment hypothesis: visual processing speed deteriorates when viewing a red background because the magnocellular system is inhibited by red light; and (2) the blue-enhancement hypothesis: the detection of both visual and auditory signals is enhanced when viewing a blue background because it stimulates the blue-light sensitive intrinsically photosensitive retinal ganglion cells (ipRGCs), which trigger a higher alert state. Participants were exposed to different backgrounds while performing an audiovisual simultaneity judgment (SJ) task: a flash and a beep were presented at pre-designated stimulus onset asynchronies (SOAs) and participants judged whether or not the two stimuli were presented simultaneously. Experiment 1 demonstrated a shift of the point of subjective simultaneity (PSS) toward the visual-leading condition in the red compared to the blue background when the flash was presented in the periphery. In Experiment 2, the stimulation of ipRGCs was specifically manipulated to test the blue-enhancement hypothesis. The results showed no support for this hypothesis, perhaps due to top-down cortical modulations. Taken together, the shift of PSS toward the visual-leading condition in the red background was attributed to impaired visual processing speed with respect to auditory processing speed, caused by the inhibition of the magnocellular system under red light.