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Auditory M100 component 1: relationship to Heschl's gyri
1Department of Psychiatry, University of Colorado Health Sciences Center, Denver 80262.
Brain Research. Cognitive Brain Research
|July 1, 1994
Summary
This study pinpointed the brain region generating the M100 auditory evoked field. Results indicate the auditory koniocortex, near Heschl's gyrus, is the primary source for this auditory processing component.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Biophysics
Background:
- The M100 component of auditory evoked fields (EFs) is a key indicator of early auditory processing.
- Localizing the precise neuroanatomic generator of the M100 is crucial for understanding auditory pathways.
Purpose of the Study:
- To determine the neuroanatomic origin of the 100 ms latency magnetic auditory evoked field (M100) component.
- To correlate magnetoencephalography (MEG) source data with detailed brain anatomy.
Main Methods:
- Recorded magnetic EFs using a seven-channel gradiometer in response to auditory tone pips.
- Utilized a least squares inverse solution algorithm to estimate M100 source locations.
- Integrated MEG data with 3D-rendered superior temporal gyri (STG) from MRI scans.
Main Results:
- M100 sources were localized within the superior temporal gyri (STG) for all participants.
- In the left hemisphere, all M100 sources were located in or adjacent to Heschl's gyrus.
- In the right hemisphere, most M100 sources were in Heschl's gyrus, with a few located anteriorly.
Conclusions:
- The findings strongly support Heschl's gyrus as the primary location for the M100 auditory evoked field source.
- The auditory koniocortex is identified as the neuroanatomic generator of the M100 component.