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Sounds enhance visual completion processes.

Ruxandra I Tivadar1, Chrysa Retsa2, Nora Turoman2

  • 1The LINE (Laboratory for Investigative Neurophysiology), Department of Radiology, University Hospital Center and University of Lausanne, 1011, Lausanne, Switzerland; Department of Ophthalmology, University of Lausanne and Fondation Asile des Aveugles, 1003, Lausanne, Switzerland.

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Summary
This summary is machine-generated.

Sounds enhance illusory contour perception, a key aspect of mid-level vision. This multisensory integration improves visual completion by increasing perceived brightness, offering potential benefits for low-vision patients.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Everyday vision relies on processes like figure-ground segregation and object recognition, often succeeding in challenging conditions.
  • Illusory contours (ICs) exemplify mid-level vision, with neural correlates around 100-150 ms post-stimulus in lateral-occipital cortices (the IC effect).
  • While multisensory influences on low-level and high-level vision are known, their impact on mid-level vision remains unexplored.

Purpose of the Study:

  • To investigate whether auditory stimuli can influence the neural processing of illusory contours (ICs).
  • To explore the mechanisms by which multisensory integration might benefit mid-level visual perception.
  • To determine if sounds affect the IC effect and associated brain activity.

Main Methods:

  • Recorded 128-channel electroencephalography (EEG) event-related potentials (ERPs) from 17 participants viewing ICs and no-contour (NC) stimuli.
  • Presented stimuli with and without task-irrelevant sounds to assess multisensory effects.
  • Utilized source-level analysis to identify brain regions involved and conducted control experiments with amodal stimuli.

Main Results:

  • The IC effect was significantly enhanced by the presence of sounds.
  • Sounds recruited distinct brain configurations in the 70-170 ms post-stimulus window, including enhanced activity in the lateral occipital cortex (LOC), inferior parietal lobe (IPL), and primary visual cortex (V1).
  • Sound-enhanced activity in these regions showed inter-regional correlation only when sounds were present; control experiments suggested brightness enhancement, not shape formation, as the primary effect.

Conclusions:

  • This study provides the first evidence that multisensory processes enhance mid-level visual perception and everyday visual completion.
  • Auditory input augments the perception of illusory contours, at least partly, by enhancing perceived brightness.
  • Findings have significant implications for developing visual aids and treatments for individuals with low vision.