Department of Psychology, Medical Humanities College, Guiyang University of Chinese Medicine, Guiyang 550025, China; Cognitive Neuroscience Laboratory, Graduate School of Natural Science and Technology, Okayama University, Okayama 7008530, Japan.
Department of Light and Chemical Engineering, Guizhou Light Industry Technical College, Guiyang 550025, China.
Int J Psychophysiol. 2018 Feb;124:1-11. doi: 10.1016/j.ijpsycho.2017.12.004. Epub 2017 Dec 15.
Recent research has shown that the magnitudes of responses to multisensory information are highly dependent on the stimulus structure. The temporal proximity of multiple signal inputs is a critical determinant for cross-modal integration. Here, we investigated the influence that temporal asynchrony has on audiovisual integration in both younger and older adults using event-related potentials (ERP). Our results showed that in the simultaneous audiovisual condition, except for the earliest integration (80-110ms), which occurred in the occipital region for older adults was absent for younger adults, early integration was similar for the younger and older groups. Additionally, late integration was delayed in older adults (280-300ms) compared to younger adults (210-240ms). In audition‑leading vision conditions, the earliest integration (80-110ms) was absent in younger adults but did occur in older adults. Additionally, after increasing the temporal disparity from 50ms to 100ms, late integration was delayed in both younger (from 230 to 290ms to 280-300ms) and older (from 210 to 240ms to 280-300ms) adults. In the audition-lagging vision conditions, integration only occurred in the A100V condition for younger adults and in the A50V condition for older adults. The current results suggested that the audiovisual temporal integration pattern differed between the audition‑leading and audition-lagging vision conditions and further revealed the varying effect of temporal asynchrony on audiovisual integration in younger and older adults.
最近的研究表明，多感官信息的反应幅度高度依赖于刺激结构。多个信号输入的时间接近是跨模态整合的关键决定因素。在这里，我们使用事件相关电位 (ERP) 研究了时间失配对年轻和老年成年人视听整合的影响。我们的结果表明，在同时视听条件下，除了最早的整合（80-110ms）发生在老年人的枕叶区域外，年轻人则没有，年轻人和老年人的早期整合相似。此外，老年人的晚期整合（280-300ms）比年轻人（210-240ms）延迟。在听觉领先视觉条件下，年轻人不存在最早的整合（80-110ms），但老年人存在。此外，当时间差异从 50ms 增加到 100ms 时，年轻人（从 230 到 290ms 到 280-300ms）和老年人（从 210 到 240ms 到 280-300ms）的晚期整合都延迟了。在听觉滞后视觉条件下，年轻人仅在 A100V 条件下发生整合，而老年人仅在 A50V 条件下发生整合。当前的结果表明，听觉领先和听觉滞后视觉条件下的视听时间整合模式不同，进一步揭示了时间失配对年轻和老年成年人视听整合的不同影响。
