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Temporal ventriloquism along the path of apparent motion: speed perception under different spatial grouping
Cansu Ogulmus1,2,3, Merve Karacaoglu1,3, Hulusi Kafaligonul4,5,6
1National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey.
Experimental Brain Research
|December 29, 2017
Summary
Spatial grouping principles in vision influence how sounds affect perceived speed. Uniform connectedness, particularly horizontal connections, reduces the temporal ventriloquism effect in audiovisual perception.
Area of Science:
- Cognitive Neuroscience
- Psychology
- Visual Perception
Background:
- Coherent multisensory percepts rely on intramodal perceptual grouping and crossmodal interactions.
- The underlying principles governing these coordinating mechanisms are not fully understood.
Purpose of the Study:
- To investigate how visual spatial grouping principles modulate audiovisual interactions in time.
- To examine the influence of spatial grouping on the temporal ventriloquism effect on perceived speed.
Main Methods:
- Utilized the temporal ventriloquism illusion to study audiovisual interactions.
- Manipulated spatial grouping principles (proximity, uniform connectedness, similarity/common fate) in apparent motion displays.
- Measured observers' speed comparisons under varying sound timing conditions.
Main Results:
- Temporal ventriloquism effects on perceived speed were observed in multi-object visual displays.
- These audiovisual interactions were modulated by spatial grouping principles.
- Uniform connectedness, especially with horizontal connecting elements, reduced the influence of sound timing on perceived speed.
Conclusions:
- The impact of sound timing on perceived speed is present across various spatial configurations.
- Intramodal spatial grouping principles, like uniform connectedness, can modulate audiovisual temporal interactions.
- Visual spatial organization plays a role in how sensory information is integrated over time.
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