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      Temporal ventriloquism along the path of apparent motion: speed perception under different spatial grouping principles

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      Author
      Ogulmus, C.
      Karacaoglu, M.
      Kafaligonul, H.
      Date
      2018
      Source Title
      Experimental Brain Research
      Print ISSN
      0014-4819
      Publisher
      Springer Verlag
      Volume
      236
      Issue
      3
      Pages
      629 - 643
      Language
      English
      Type
      Article
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      Abstract
      The coordination of intramodal perceptual grouping and crossmodal interactions plays a critical role in constructing coherent multisensory percepts. However, the basic principles underlying such coordinating mechanisms still remain unclear. By taking advantage of an illusion called temporal ventriloquism and its influences on perceived speed, we investigated how audiovisual interactions in time are modulated by the spatial grouping principles of vision. In our experiments, we manipulated the spatial grouping principles of proximity, uniform connectedness, and similarity/common fate in apparent motion displays. Observers compared the speed of apparent motions across different sound timing conditions. Our results revealed that the effects of sound timing (i.e., temporal ventriloquism effects) on perceived speed also existed in visual displays containing more than one object and were modulated by different spatial grouping principles. In particular, uniform connectedness was found to modulate these audiovisual interactions in time. The effect of sound timing on perceived speed was smaller when horizontal connecting bars were introduced along the path of apparent motion. When the objects in each apparent motion frame were not connected or connected with vertical bars, the sound timing was more influential compared to the horizontal bar conditions. Overall, our findings here suggest that the effects of sound timing on perceived speed exist in different spatial configurations and can be modulated by certain intramodal spatial grouping principles such as uniform connectedness.
      Keywords
      Apparent motion
      Audiovisual interactions
      Multisensory
      Spatial grouping
      Speed perception
      Temporal ventriloquism
      Permalink
      http://hdl.handle.net/11693/50273
      Published Version (Please cite this version)
      https://doi.org/10.1007/s00221-017-5159-1
      Collections
      • Department of Psychology 139
      • Interdisciplinary Program in Neuroscience 73
      • National Magnetic Resonance Research Center 147

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