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Mental imagery changes multisensory perception.

Christopher C Berger1, H Henrik Ehrsson

  • 1Department of Neuroscience, Karolinska Institutet, 17177 Stockholm, Sweden. christopher.c.berger@ki.se

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Summary
This summary is machine-generated.

Mental imagery can integrate with real sensory input to create multisensory illusions, demonstrating that imagined stimuli can interact with perception. This research explores how the brain combines internal and external sensory information.

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • Multisensory interactions are crucial for perceiving the external world.
  • Mental imagery research shows overlap with perception but hasn't explored multisensory integration.
  • Existing studies focus on cross-modal similarities within perception, not imagery's integration capabilities.

Purpose of the Study:

  • To investigate if mental imagery can integrate with perceptual stimuli.
  • To determine if imagery can induce multisensory illusions.
  • To examine the relationship between mental imagery and multisensory perception.

Main Methods:

  • Adapted classic multisensory paradigms to include mental imagery.
  • Used auditory and visual imagery alongside perceptual stimuli.
  • Tested for illusory percepts in modified cross-bounce, ventriloquist, and McGurk illusions.

Main Results:

  • Auditory imagery induced an illusory bounce percept with visual motion.
  • Visual imagery caused sound translocation, mimicking the ventriloquist illusion.
  • Auditory speech imagery enhanced illusory speech perception in a McGurk paradigm.

Conclusions:

  • Mental imagery can integrate with real sensory stimuli to form multisensory percepts.
  • Findings support perception-based theories of mental imagery.
  • Neuronal signals from imagined stimuli can integrate with real stimuli across different sensory modalities.