When is now? Perception of simultaneity
When is now? Perception of simultaneity
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DOI：
10.1098/rspb.2000.1326
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发表时间：
2001-01-07
影响因子：
4.7
通讯作者：
Porter, NR
中科院分区：
文献类型：
--
作者：
Stone, JV;Hunkin, NM;Porter, NR
我们解决以下问题：感知听觉刺激和视觉刺激的时间之间是否存在差异（D）？在 1000 次试验的每一次中，观察者都会看到一对光声对，由 -250 毫秒（声音先行）和 +250 毫秒之间的刺激开始异步 (SOA) 分开。观察者通过按两个（是或否）键之一来指示光-声音对是否同时出现。最有可能产生肯定响应的 SOA 被定义为主观同时性点 (PSS)。 PSS 值介于 -21 毫秒（即灯光之前 21 毫秒的声音）和 +150 毫秒之间。有证据表明每个 PSS 都是观察者特定的。在第二个实验中，每个观察者都使用两个观察者刺激距离进行测试。所得的 PSS 值高度相关（r = 0.954，P = 0.003），表明每个观察者的 PSS 是稳定的。 PSS 值受观察者刺激距离的显着影响。这表明观察者没有考虑距离的变化导致光和声音到达时间的差异。还估计了对单一视觉和听觉刺激的简单反应时间的差异 RTd；没有发现 RTd 具有观察者特异性或稳定的证据。讨论了这些发现对多感官刺激感知的影响。
We address the following question: Is there a difference (D) between the amount of time for auditory and visual stimuli to be perceived? On each of 1000 trials, observers were presented with a light-sound pair, separated by a stimulus onset asynchrony (SOA) between -250 ms (sound first) and +250 ms. Observers indicated if the light-sound pair came on simultaneously by pressing one of two (yes or no) keys. The SOA most likely to yield affirmative responses was defined as the point of subjective simultaneity (PSS). PSS values were between -21 ms (i.e. sound 21 ms before Light) and +150 ms. Evidence is presented that each PSS is observer specific. In a second experiment, each observer was tested using two observer-stimulus distances. The resultant PSS values are highly correlated (r = 0.954, P = 0.003), suggesting that each observer's PSS is stable. PSS values were significantly affected by observer-stimulus distance. suggesting that observers do not take account of chang-es in distance on the resultant difference in arrival times of light and sound. The difference RTd in simple reaction time to single visual and auditory stimuli was also estimated; no evidence that RTd is observer specific or stable was found. The implications of these findings for the perception of multisensory stimuli are discussed.