School of Psychology and Counselling, Queensland University of Technology (QUT), Kelvin Grove, QLD, 4059, Australia.
Sci Rep. 2022 Sep 12;12(1):15292. doi: 10.1038/s41598-022-19665-9.
When the brain is exposed to a temporal asynchrony between the senses, it will shift its perception of simultaneity towards the previously experienced asynchrony (temporal recalibration). It is unknown whether recalibration depends on how accurately an individual integrates multisensory cues or on experiences they have had over their lifespan. Hence, we assessed whether musical training modulated audiovisual temporal recalibration. Musicians (n = 20) and non-musicians (n = 18) made simultaneity judgements to flash-tone stimuli before and after adaptation to asynchronous (± 200 ms) flash-tone stimuli. We analysed these judgements via an observer model that described the left and right boundaries of the temporal integration window (decisional criteria) and the amount of sensory noise that affected these judgements. Musicians' boundaries were narrower (closer to true simultaneity) than non-musicians', indicating stricter criteria for temporal integration, and they also exhibited enhanced sensory precision. However, while both musicians and non-musicians experienced cumulative and rapid recalibration, these recalibration effects did not differ between the groups. Unexpectedly, cumulative recalibration was caused by auditory-leading but not visual-leading adaptation. Overall, these findings suggest that the precision with which observers perceptually integrate audiovisual temporal cues does not predict their susceptibility to recalibration.
当大脑对外界感觉输入的时间不同步时，它会调整对同时性的感知，使其向之前经历过的时间不同步的方向偏移（时间校准）。目前还不清楚这种校准是取决于个体对多感官线索的准确整合程度，还是取决于他们一生中的经历。因此，我们评估了音乐训练是否会调节视听时间校准。音乐家（n=20）和非音乐家（n=18）在适应异步（±200ms）闪光音刺激前后，对闪光音刺激进行同时性判断。我们通过一个观察者模型来分析这些判断，该模型描述了时间整合窗口的左右边界（决策标准）以及影响这些判断的感官噪声量。音乐家的边界比非音乐家的更窄（更接近真实的同时性），这表明他们对时间整合的标准更严格，同时他们也表现出更高的感官精度。然而，尽管音乐家和非音乐家都经历了累积和快速的校准，但两组之间的校准效果没有差异。出乎意料的是，累积校准是由听觉领先而不是视觉领先的适应引起的。总的来说，这些发现表明，观察者在感知上整合视听时间线索的精确性并不能预测他们对校准的敏感性。
