• Authors: Yaru Wang, Makoto Ichikawa
• Title: Effect of stimulus onset and offset asynchrony on audiovisual temporal recalibration.
• Journal(書誌情報）: Vision Research
• doi: 10.1016/j.visres.2025.108595
• 論文URL: https://www.sciencedirect.com/science/article/pii/S0042698925000562

• Abstract:
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.

• 著者Contact先の email: michikawa[at]chiba-u.jp（[at]を@に変更してください。）
• 日本語によるコメント（オプション，200-300字で）

刺激の開始時と終了時のいずれかに、知覚的に区別しやすい100ms以上の長さの視聴覚刺激を用い、数分間の繰り返し試聴によって視聴覚刺激のタイミングに関する知覚がどのように変動するのかを検討しました。その結果、視覚刺激と聴覚刺激の開始時の間、またはそれらの終了時のあいだに時間差を設けた条件でのみ、視聴覚刺激間の時間差を小さく感じる順応的変化が生じることが明らかになりました。この結果は、人間の知覚認知系が、開始や終了のような刺激の時系列的部位ごとに時間情報を符号化し、その時間差に順応するよう情報の処理を行なっていることを示唆しています。

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