The modulation of background color on perceiving audiovisual simultaneity
| Autor: | Su-Ling Yeh, Akiko Matsumoto, Kuaug-Tsu Shih, Sei-ichi Tsujimura, Sung-En Chien, Wakayo Yamashita, Yi-Chuan Chen |
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| Rok vydání: | 2019 |
| Předmět: |
Adult
Male Retinal Ganglion Cells medicine.medical_specialty genetic structures Adolescent media_common.quotation_subject Color Audiology Stimulus (physiology) 050105 experimental psychology Alert state Visual processing 03 medical and health sciences Young Adult 0302 clinical medicine Background color Perception Modulation (music) medicine Humans 0501 psychology and cognitive sciences Red light media_common 05 social sciences Intrinsically photosensitive retinal ganglion cells Sensory Systems Ophthalmology Pattern Recognition Visual Auditory Perception Visual Perception Female Psychology 030217 neurology & neurosurgery Photic Stimulation |
| Zdroj: | Vision research. 172 |
| ISSN: | 1878-5646 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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