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Temporal Adaptation to Audiovisual Asynchrony Generalizes Across Different Sound Frequencies

机译:视听异步的时间适应在不同的声音频率中普遍存在

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摘要

The human brain exhibits a highly adaptive ability to reduce natural asynchronies between visual and auditory signals. Even though this mechanism robustly modulates the subsequent perception of sounds and visual stimuli, it is still unclear how such a temporal realignment is attained. In the present study, we investigated whether or not temporal adaptation generalizes across different auditory frequencies. In a first exposure phase, participants adapted to a fixed 220-ms audiovisual asynchrony or else to synchrony for 3 min. In a second phase, the participants performed simultaneity judgments (SJs) regarding pairs of audiovisual stimuli that were presented at different stimulus onset asynchronies (SOAs) and included either the same tone as in the exposure phase (a 250 Hz beep), another low-pitched beep (300 Hz), or a high-pitched beep (2500 Hz). Temporal realignment was always observed (when comparing SJ performance after exposure to asynchrony vs. synchrony), regardless of the frequency of the sound tested. This suggests that temporal recalibration influences the audiovisual perception of sounds in a frequency non-specific manner and may imply the participation of non-primary perceptual areas of the brain that are not constrained by certain physical features such as sound frequency.
机译:人脑具有减少视觉和听觉信号之间自然不同步的高度适应能力。即使此机制稳健地调节了声音和视觉刺激的后续感知,但仍不清楚如何实现这种时间重新排列。在本研究中,我们调查了时间适应性是否在不同的听觉频率上普遍存在。在第一个曝光阶段,参与者适应于固定的220毫秒视听异步或同步3分钟。在第二阶段,参与者对视听刺激对进行了同时判断(SJ),这些对视听刺激以不同的刺激发作异步(SOA)出现,并且包括与暴露阶段相同的音调(250 Hz哔哔声),另一低高音提示音(300 Hz)或高音提示音(2500 Hz)。无论测试声音的频率如何,总是观察到时间的重新排列(比较异步和同步后的SJ性能)。这表明时间重新校准会以非特定频率的方式影响声音的视听感知,并且可能暗示不受诸如声音频率之类的某些物理特征约束的大脑非主要感知区域的参与。

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