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Related Experiment Videos

Neural activity in speech-sensitive auditory cortex during silence.

M D Hunter1, S B Eickhoff, T W R Miller

  • 1Sheffield Cognition and Neuroimaging Laboratory (SCANLab), Academic Clinical Psychiatry, Division of Genomic Medicine, University of Sheffield, Sheffield S5 7JT, United Kingdom. m.d.hunter@sheffield.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|December 24, 2005
PubMed
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The brain

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Brain Activity

Background:

  • Auditory hallucinations involve hearing voices without external stimuli, suggesting internal brain activity.
  • These hallucinations occur in various states, including psychosis and altered consciousness, hinting at spontaneous auditory cortex activation.

Purpose of the Study:

  • To investigate baseline activity in speech-sensitive auditory regions using functional MRI.
  • To understand the spontaneous neural activity underlying auditory perception during silence.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Baseline brain activity in speech-sensitive auditory regions was examined during silence.

Main Results:

Related Experiment Videos

  • Speech-sensitive auditory cortex exhibits intermittent, significant activity increases in substantial portions of its volume during silence.
  • Spontaneous activations were observed bilaterally, particularly in left primary/association auditory cortices and anterior cingulate cortex.

Conclusions:

  • The anterior cingulate cortex modulates endogenous activity in auditory regions, leading to spontaneous activation during silence.
  • This spontaneous brain activity may represent a neural substrate for auditory hallucinations, explaining their prevalence.