Wang Yaru, Ichikawa Makoto
Graduate School of Science and Engineering, Chiba University, Chiba, Japan.
Graduate School of Humanities, Chiba University, Chiba, Japan.
Vision Res. 2025 May;230:108595. doi: 10.1016/j.visres.2025.108595. Epub 2025 Apr 12.
When short audiovisual stimuli are presented with a consistent temporal lag, adaptive temporal recalibration occurs to reduce the asynchrony between the stimuli. We investigated adaptive temporal recalibration in prolonged audiovisual stimuli. Specifically, we examined whether temporal recalibration occurs for both the onset and offset of stimuli when these stimulus parts can be distinguished. We also examined whether a constant temporal lag (the auditory stimulus preceded or followed the visual stimulus by 240 ms or 0 ms) at the onset (or offset) of the audiovisual stimuli would allow recalibration for the stimuli's offset (or onset). Experiments 1 and 2 explored whether temporal recalibration occurs at the audiovisual stimuli's onset (or offset) when the onset (or offset) is asynchronous in the adaptation phase. Significant temporal recalibration was found only in the auditory leading condition in these experiments. Experiments 3 and 4 investigated whether temporal recalibration occurs at the audiovisual stimuli's offset (or onset) when the onset (or offset) was asynchronous in the adaptation phase. No significant temporal recalibration was observed in auditory and visual leading conditions in these experiments. These results demonstrated that temporal asynchrony adaptation is only effective when the temporal context (onset or offset) of adapting and test events is matched. The present results suggest that the adaptive temporal recalibration process for prolonged audiovisual stimuli depends upon the onset/offset channel processes and awareness of the temporal lag between those stimulus parts, rather than upon some automatic processing of each stimulus part.
当短视听刺激以一致的时间延迟呈现时，会发生适应性时间重新校准以减少刺激之间的异步性。我们研究了长时间视听刺激中的适应性时间重新校准。具体而言，当这些刺激部分可以区分时，我们检查了刺激的开始和结束是否都会发生时间重新校准。我们还检查了视听刺激开始（或结束）时的恒定时间延迟（听觉刺激比视觉刺激提前或延迟240毫秒或0毫秒）是否会使刺激的结束（或开始）发生重新校准。实验1和实验2探究了在适应阶段开始（或结束）异步时，视听刺激的开始（或结束）是否会发生时间重新校准。在这些实验中，仅在听觉领先条件下发现了显著的时间重新校准。实验3和实验4研究了在适应阶段开始（或结束）异步时，视听刺激的结束（或开始）是否会发生时间重新校准。在这些实验的听觉和视觉领先条件下均未观察到显著的时间重新校准。这些结果表明，时间异步适应仅在适应事件和测试事件的时间背景（开始或结束）匹配时才有效。目前的结果表明，长时间视听刺激的适应性时间重新校准过程取决于开始/结束通道过程以及对这些刺激部分之间时间延迟的感知，而不是取决于对每个刺激部分的某些自动处理。
