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Imaging subcortical auditory activity in humans

A R Guimaraes1, J R Melcher, T M Talavage

  • 1Department of Radiology, Massachusetts General Hospital, Charlestown 02129, USA.

Human Brain Mapping
|July 23, 1998
PubMed
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Researchers developed a cardiac gating method to improve functional magnetic resonance imaging (fMRI) of the auditory brain stem. This technique reduces motion artifacts, enabling clearer visualization of sound processing in subcortical auditory areas.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neuroimaging

Background:

  • Limited physiological data exists on how humans process auditory information.
  • Functional magnetic resonance imaging (fMRI) has primarily studied the auditory cortex, with a lack of data for subcortical auditory areas.
  • Cardiac-related pulsatile motion is a potential impediment to fMRI in brain-stem auditory regions.

Purpose of the Study:

  • To investigate the impact of cardiac-related motion on fMRI of auditory pathways.
  • To apply a cardiac gating technique to map sound-related activity in the auditory cortex and brain stem.
  • To enhance the visualization of early auditory processing stages in subcortical structures.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) with a cardiac gating method to eliminate pulsatile motion.

Related Experiment Videos

  • Mapped sound-related brain activity in both auditory cortices and inferior colliculi (brain stem).
  • Compared imaging results with and without cardiac gating to assess its effectiveness.

    • Main Results:

    • Auditory activation in both the inferior colliculi and auditory cortex became more discernible with cardiac gating.
    • The improvement in brain-stem imaging was primarily due to reduced signal variability, not increased signal change.
    • Results support the hypothesis that pulsatile motion significantly affects brain-stem fMRI.

    Conclusions:

    • Cardiac gating is an effective method for reducing motion artifacts in brain-stem auditory imaging.
    • This technique clarifies sound-related activity in subcortical auditory areas, including the inferior colliculi.
    • The findings pave the way for comprehensive studies of the entire human auditory pathway using fMRI.