Temporal order perception of sensory stimuli under motion perception in audiovisual processing

Motion perception has an important role in a dynamic environment. However, the mechanism of perception of external stimuli under motion perception is not fully clarified. This study investigated the relationship between temporal order perception and motion perception on audiovisual processing. Participants performed audiovisual temporal order judgment (TOJ) task under apparent motion condition and non-apparent motion condition in Experiment 1 and also under random-order presentation condition in Experiment 2. Our result shows that the perceived order and temporal resolution between audiovisual stimuli is different between apparent motion perception and non-apparent motion perception. Besides, the perceived order during apparent motion perception was processed regardless of prediction. In particular, motion perception and exogenous attention are closely related. The relationship shows that motion perception may be exogenously processed by bottom-up signals of external stimulus.