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Assessing the accuracy of topographic EEG mapping for determining local brain function
I A Cook1, R O'Hara, S H Uijtdehaage
1Neuropsychiatric Institute and Hospital and Department of Psychiatry and Biobehavioral Sciences, UCLA School of Medicine, University of California, Los Angeles, USA. icook@ucla.edu
Electroencephalography and Clinical Neurophysiology
|January 28, 1999
Summary
Topographic electroencephalography (EEG) mapping accurately reflects local brain function. Relative power measures and specific electrode montages significantly improve the accuracy of EEG brain mapping compared to absolute power.
Area of Science:
- Neuroscience
- Medical Imaging
Background:
- Assessing local cerebral function with topographic electroencephalography (EEG) maps is debated.
- EEG mapping accuracy requires validation against other measures of brain function.
Purpose of the Study:
- To test the accuracy of topographic EEG mapping.
- To examine the association between EEG electrical activity and cerebral perfusion.
Main Methods:
- Simultaneous EEG mapping and (H15)2O positron emission tomography (PET) scanning in 6 healthy adults.
- Data acquisition at rest and during a motor task.
- Analysis of EEG data using 3 different montages and 2 power measures (absolute and relative).
Main Results:
- Relative EEG power showed stronger associations with cerebral perfusion than absolute power.
- Bipolar electrode pair calculations and averaged power over shared electrodes improved map accuracy.
- Specific EEG measures and montages significantly influenced the correlation with perfusion.
Conclusions:
- Topographic EEG mapping can accurately reflect local brain function.
- The selection of EEG measures and montages is crucial for accurate functional brain mapping.
- EEG mapping accuracy is comparable to other neuroimaging techniques.