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Related Experiment Videos

A functional study of auditory verbal imagery.

S S Shergill1, E T Bullmore, M J Brammer

  • 1Institute of Psychiatry and GKT School of Medicine and Dentistry, University of London.

Psychological Medicine
|March 10, 2001
PubMed
Summary

Functional MRI reveals that both inner speech and auditory verbal imagery activate the left inferior frontal cortex. Auditory verbal imagery additionally engages lateral temporal cortices, suggesting distinct neural pathways for imagined speech.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • Investigating the neural basis of inner speech and auditory verbal imagery.
  • Utilizing functional magnetic resonance imaging (fMRI) in healthy volunteers.

Purpose of the Study:

  • To map the functional anatomy of inner speech.
  • To explore the neural correlates of auditory verbal imagery (imagining speech).
  • To test the hypothesis of left inferior frontal activation for both processes and additional temporal activation for imagery.

Main Methods:

  • Subjects underwent fMRI scanning using a 1.5 Tesla magnet.
  • Participants performed tasks involving inner speech and auditory verbal imagery.

Main Results:

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  • Inner speech activated the left inferior frontal/insula, left temporo-parietal cortex, right cerebellum, and supplementary motor area.
  • Auditory verbal imagery showed activation in inner speech areas plus the left precentral and superior temporal gyri (STG), and their right homologues.

Conclusions:

  • Findings support the involvement of the 'articulatory loop' in both inner speech and auditory verbal imagery.
  • Greater engagement of verbal self-monitoring mechanisms is indicated during auditory verbal imagery.