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Source location of a 50 msec latency auditory evoked field component
M Reite1, P Teale, J Zimmerman
1Department of Psychiatry, University of Colorado Health Sciences Center, Denver 80262.
Electroencephalography and Clinical Neurophysiology
|December 1, 1988
Summary
This study identified the M50 magnetic field component in auditory evoked responses. M50 sources were located in the planum temporale cortex, offering insights into auditory processing.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Biophysics
Background:
- Auditory evoked magnetic fields provide insights into brain activity.
- Understanding the neural sources of auditory evoked potentials (AEPs) is crucial for diagnosing auditory processing disorders.
Purpose of the Study:
- To investigate the neural sources of the M50 component of auditory evoked magnetic fields.
- To compare the M50 component with the P50 component of auditory evoked potentials.
- To localize the M50 source within the human auditory cortex.
Main Methods:
- Recording auditory evoked magnetic fields (M50) and auditory evoked potentials (P50) in response to tone pips.
- Utilizing isofield topographical contour maps to estimate M50 source locations.
- Employing magnetic resonance imaging (MRI) to identify neuroanatomical structures at the estimated source locations.
Main Results:
- An approximately 50 msec latency component (M50) was identified in magnetic recordings, corresponding to the P50 in EEG.
- M50 source locations were estimated to be in the planum temporale cortex in both hemispheres.
- M50 and P50 latencies were largely similar, with slight differences in one subject over the left hemisphere.
Conclusions:
- The M50 component of auditory evoked magnetic fields originates from the planum temporale cortex.
- This finding contributes to understanding the neuroanatomical basis of early auditory processing.
- The study highlights the utility of magnetoencephalography (MEG) in localizing auditory processing sources.