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Aberrant localization of synchronous hemodynamic activity in auditory cortex reliably characterizes schizophrenia
Vince D Calhoun1, Kent A Kiehl, Peter F Liddle
1Institute of Living, Olin Neuropsychiatry Research Center, 200 Retreat Avenue, Hartford, CT 06106, USA.
Biological Psychiatry
|March 31, 2004
Summary
Schizophrenia brains show altered auditory cortex synchrony, particularly in the superior temporal gyrus (STG). This study reveals distinct functional patterns in STG regions, aiding in schizophrenia assessment.
Area of Science:
- Neuroimaging
- Psychiatry
- Auditory Neuroscience
Background:
- Schizophrenia is characterized by auditory cortex abnormalities, especially in the superior temporal gyrus (STG).
- Existing research often relies on task-dependent measures of auditory cortex function.
Purpose of the Study:
- To investigate auditory cortex function in schizophrenia using a task-uncorrelated measure.
- To identify functional differences in the STG between patients with schizophrenia and healthy controls.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to acquire data.
- Synchronous hemodynamic independent maps (SHIMs) were calculated for the auditory cortex.
- Patients with schizophrenia and matched healthy controls performed an auditory oddball task.
Main Results:
- Patient SHIMs showed increased synchrony in ventral/medial STG (including BA 42).
- Control SHIMs exhibited greater synchrony in dorsal/lateral STG (excluding BA 42).
- A subtractive comparison accurately differentiated patients from controls (97% initial, 94% confirmatory accuracy).
Conclusions:
- Aberrant coherence patterns in temporal lobe regions are a key feature of schizophrenia.
- These findings highlight significant functional differences in the STG.
- The developed method shows potential as a quantitative clinical tool for schizophrenia assessment.