Wu Jinglong, Yang Weiping, Gao Yulin, Kimura Takahiro
The Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.
Neuroreport. 2012 Jul 11;23(10):616-20. doi: 10.1097/WNR.0b013e3283552b0f.
Although age-related multisensory integration has been investigated previously, the effects of aging on multisensory integration elicited by peripherally presented audiovisual (AV) stimuli remain unclear. In this study, visual, auditory, and AV stimuli were randomly presented to the left or the right of the central fixation point; during this time, participants (young and old adults) were asked to respond promptly to target stimuli. Using a race model to analyze the response times, our results showed that the AV behavioral facilitation of young participants was significant (P<0.05), with response times ranging from 240 to 450 ms and peaking at 360 ms (14%). However, the AV behavioral facilitation of elderly participants was delayed and showed an extensive range, with response times ranging from 260 to 540 ms and with a lower peak (12.6%) and delay time (390 ms). We found that the time window of AV behavioral facilitation in elderly participants was longer but more delayed than that in the young participants when the AV stimuli were presented peripherally. This finding also further confirmed that peripheral resolution decreased with age.
尽管先前已经对与年龄相关的多感官整合进行了研究，但衰老对外周呈现的视听（AV）刺激引发的多感官整合的影响仍不清楚。在本研究中，视觉、听觉和AV刺激被随机呈现于中央注视点的左侧或右侧；在此期间，要求参与者（年轻人和老年人）对目标刺激迅速做出反应。使用竞争模型分析反应时间，我们的结果表明，年轻参与者的AV行为促进作用显著（P<0.05），反应时间在240至450毫秒之间，峰值为360毫秒（14%）。然而，老年参与者的AV行为促进作用延迟且范围广泛，反应时间在260至540毫秒之间，峰值较低（12.6%）且延迟时间较长（390毫秒）。我们发现，当外周呈现AV刺激时，老年参与者的AV行为促进时间窗口比年轻参与者更长但延迟更明显。这一发现也进一步证实了外周分辨率随年龄下降。
