Bayesian calibration of simultaneity in audiovisual temporal order judgments.
Bayesian calibration of simultaneity in audiovisual temporal order judgments.
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贝叶斯对视听时间秩序判断中同时性的校准。
DOI：
10.1371/journal.pone.0040379
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Kitazawa S
中科院分区：
文献类型：
--
作者：
Yamamoto S;Miyazaki M;Iwano T;Kitazawa S
在重复暴露于以一个频繁顺序呈现的两个连续视听刺激之后，受试者最终感觉到以与同时发生的顺序相同的顺序相隔一定滞后时间的一对(滞后适应)。相比之下，我们先前发现，知觉变化在触觉刺激的反应下发生在相反的方向，符合贝叶斯整合理论(贝叶斯校准)。我们进一步表明，在理论上，当滞后适应完全可操作时，不能观察到贝叶斯校准的效果。这导致了一种假设，即贝叶斯校准影响对视听刺激顺序的判断，但这种影响隐藏在滞后适应机制之后。在目前的研究中，我们使用1046和1480赫兹的两种声音表明滞后适应是音调不敏感的。这使我们能够通过将一个音调与声音优先刺激联系起来，将另一个音调与光优先刺激联系起来，从而消除滞后适应。当我们在不同的区块中呈现每种类型的刺激(高音或低音)时，对于与声音优先的刺激相关的音调，同时性的点转移到“声音优先”，对于与光优先刺激相关的音高，同步的点转移到“光优先”。这些结果与滞后适应是一致的。相比之下，当我们以随机顺序提供每种类型的刺激时，与声音优先刺激相关的音调的同时性点转移到“光优先”，而与光优先刺激相关的音调转移到“声音优先”。结果清楚地表明，贝叶斯校正是音调特定的，在视听刺激的时间顺序判断中，贝叶斯校正在音调不敏感的滞后适应之后起作用。
After repeated exposures to two successive audiovisual stimuli presented in one frequent order, participants eventually perceive a pair separated by some lag time in the same order as occurring simultaneously (lag adaptation). In contrast, we previously found that perceptual changes occurred in the opposite direction in response to tactile stimuli, conforming to Bayesian integration theory (Bayesian calibration). We further showed, in theory, that the effect of Bayesian calibration cannot be observed when the lag adaptation was fully operational. This led to the hypothesis that Bayesian calibration affects judgments regarding the order of audiovisual stimuli, but that this effect is concealed behind the lag adaptation mechanism. In the present study, we showed that lag adaptation is pitch-insensitive using two sounds at 1046 and 1480 Hz. This enabled us to cancel lag adaptation by associating one pitch with sound-first stimuli and the other with light-first stimuli. When we presented each type of stimulus (high- or low-tone) in a different block, the point of simultaneity shifted to “sound-first” for the pitch associated with sound-first stimuli, and to “light-first” for the pitch associated with light-first stimuli. These results are consistent with lag adaptation. In contrast, when we delivered each type of stimulus in a randomized order, the point of simultaneity shifted to “light-first” for the pitch associated with sound-first stimuli, and to “sound-first” for the pitch associated with light-first stimuli. The results clearly show that Bayesian calibration is pitch-specific and is at work behind pitch-insensitive lag adaptation during temporal order judgment of audiovisual stimuli.
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