Kavaklıoğlu, Efsun
Multisensory processing and crossmodal interactions in the temporal domain are crucial for survival in a dynamic environment. Temporal ventriloquism illusion demonstrates the importance of the crossmodal interactions in the temporal domain and the influences of the auditory signals (e.g., auditory time intervals) on visual perception. Attention is another mechanism playing a critical role in sensory processing, and it allows us to prioritize relevant information in the visual field. Previous studies have shown that attention can modulate multisensory processing and crossmodal interactions. The current thesis was focused on understanding whether spatial attention modulates audiovisual interactions in the temporal domain. An apparent motion paradigm of temporal ventriloquism illusion was used. The experimental design was based on auditory time interval effects on perceived visual speed. Besides speed judgment, participants performed a secondary task on discriminating static clicks. Using endogenous cues, we manipulated attention in the auditory domain and systematically changed the difficulty level of the secondary task. The results revealed a significant effect of task difficulty on audiovisual interactions in the temporal domain, such that the effects of auditory time intervals on perceived speed became larger with an increasing level of task difficulty. Moreover, the cueing effect became significant when the difficulty level of the secondary task was low, suggesting that the participants might have more resources available to process informative cues. Future studies aimed to determine the effects of task difficulty on attention and audiovisual processes may provide further insights on the involvement of attention in multisensory processing.


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Citation Formats
E. Kavaklıoğlu, “SPEED PERCEPTION IN MULTISENSORY PROFILES: WHAT IS THE EFFECT OF ATTENTION?,” M.S. - Master of Science, Middle East Technical University, 2022.