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A brain basis for musical hallucinations.

Sukhbinder Kumar1, William Sedley2, Gareth R Barnes3

  • 1Institute of Neuroscience, Medical School, Newcastle University, Newcastle upon Tyne, UK; Wellcome Trust Centre for Neuroimaging, London, UK.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|January 22, 2014
PubMed
Summary
This summary is machine-generated.

Researchers explored musical hallucinations (MH) using residual inhibition and magnetoencephalography (MEG). They identified specific brain regions and oscillatory bands associated with MH generation, offering insights into the underlying neural network.

Keywords:
Auditory cortexBeta oscillationsGamma oscillationsMagnetoencephalographyMusical hallucinationsPredictive coding

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Hallucination Research

Background:

  • The physiological basis of musical hallucinations (MH) remains poorly understood.
  • A key challenge has been the absence of methods to modulate hallucination intensity during experiments.
  • Residual inhibition, a technique used in tinnitus research, offers a potential method for studying phantom percepts.

Purpose of the Study:

  • To investigate the neural correlates of musical hallucinations (MH).
  • To explore the efficacy of residual inhibition in modulating MH intensity.
  • To identify brain activity patterns associated with MH generation using magnetoencephalography (MEG).

Main Methods:

  • A single human subject with musical hallucinations (MH) was studied.
  • Residual inhibition was induced by presenting short periods of music to suppress MH.
  • Magnetoencephalography (MEG) was employed to record brain activity, followed by source-space analysis for single-subject inference.

Main Results:

  • Musical hallucinations (MH) were successfully residually inhibited by music.
  • MEG data revealed left-lateralized increases in gamma-band power in the left anterior superior temporal gyrus, correlated with stronger MH.
  • Increased beta-band power was observed in the motor cortex and posteromedial cortex during MH.

Conclusions:

  • The findings suggest that the left anterior superior temporal gyrus, motor cortex, and posteromedial cortex form a critical network for MH generation.
  • These results support a predictive coding model where MH arise from persistent reciprocal communication within a neural hierarchy.
  • The study demonstrates the utility of residual inhibition and MEG in investigating the neurophysiology of musical hallucinations.