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Related Experiment Video

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Author Spotlight: Exploring Dynamic Neural Changes Associated with Religious Chanting
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Keeping the inner voice inside the head, a pilot fMRI study.

Massoud Stephane1, Mario Dzemidzic2, Gihyun Yoon3

  • 1Department of Psychiatry, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA.

Brain and Behavior
|January 23, 2021
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Summary
This summary is machine-generated.

The brain localizes inner speech and external voices using the same auditory pathway. This finding sheds light on the neural basis of inner voice experiences and potential mechanisms for verbal hallucinations.

Keywords:
Inner voicefMRIhallucinationsinner speechschizophrenia

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Auditory Processing

Background:

  • The inner voice, experienced during inner speech and silent reading, activates brain regions similar to external voices.
  • A key difference is the perceived spatial location: inner voices are internal, while external voices are external.

Purpose of the Study:

  • To investigate the neural basis for the differential spatial localization of inner versus external voices.
  • To understand the brain mechanisms underlying the subjective experience of the inner voice.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to compare brain activity during silent reading versus reading aloud.
  • Data preprocessing included denoising for head movement and hemodynamic response variation correction.
  • Spatiotemporal brain activity maps were generated using permutation-based statistics suitable for small sample sizes.

Main Results:

  • Silent reading, compared to reading aloud, showed increased activity in the "where" auditory pathway, including the inferior parietal lobule and middle temporal gyrus.
  • Delayed activation of the primary auditory cortex was observed during silent reading.

Conclusions:

  • Pilot data suggest that the neural resources for localizing the inner voice internally are shared with those for localizing external voices externally, specifically the "where" auditory pathway.
  • These findings have implications for understanding abnormal inner voice experiences, such as those in verbal hallucinations.