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Related Experiment Videos

Negative BOLD differentiates visual imagery and perception.

Amir Amedi1, Rafael Malach, Alvaro Pascual-Leone

  • 1Center for Noninvasive Brain Stimulation, Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02115, USA. aamedi@bidmc.harvard.edu

Neuron
|December 13, 2005
PubMed
Summary

Visual imagery and perception differ due to distinct neural activity. Deactivation in auditory cortex during mental visualization correlates with vividness, unlike sensory perception.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Neural substrates of visual perception and imagery show overlap.
  • Subjective experiences of imagining and seeing are distinct.
  • Brain activity during visual tasks requires further differentiation.

Purpose of the Study:

  • To differentiate neural mechanisms of visual imagery and perception.
  • To investigate the role of auditory cortex deactivation in visual imagery.
  • To correlate brain activity with subjective vividness of visual imagery.

Main Methods:

  • BOLD functional magnetic resonance imaging (fMRI) was used.
  • Auditory cortex deactivation was measured.
  • Correlation between brain activity and the Vividness of Visual Imagery Questionnaire (VVIQ) scores was analyzed.

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Main Results:

  • Deactivation of auditory cortex unequivocally differentiates visual imagery from visual perception.
  • During visual imagery, auditory cortex deactivation negatively correlates with visual cortex activation.
  • Auditory cortex deactivation also correlates with subjective vividness scores.

Conclusions:

  • Visual perception integrates multisensory information, modifying visual cortical activity.
  • Pure visual imagery involves isolated visual cortical activation.
  • Deactivation of irrelevant sensory processing supports the creation of mental images.