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Abstract:
In humans and other primates, the perception of an event in
one sensory modality can be altered by conflicting sensory
information in a different modality. For example, in the
ventriloquist illusion, people typically mislocalize a sound toward
a light when presented simultaneously at conflicting positions,
demonstrating crossmodal integration across a common sensory
attribute such as spatial location. Here, we show that auditory
apparent motion, elicited by presenting sounds sequentially to
different spatial locations, is automatically captured by
concurrent visual apparent motion, demonstrating strong crossmodal
integration of perceived dynamic information. Importantly, a
split-brain patient who no longer perceives visual apparent motion
was immune to this dynamic capture, highlighting the role of
cortical structures in mediating this new multisensory illusion.
Subsequent experiments with intact participants indicated that
tactile apparent motion, elicited by presenting sequential
vibrations to the index finger of each hand, is automatically
captured by either concurrent visual apparent motion or auditory
apparent motion, thereby revealing a hierarchy of dynamic capture
across sensory modalities.
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