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Local cortical function after uncomplicated subdural electrode implantation. Laboratory investigation
Daniel Yoshor1, William H Bosking, Bradley C Lega
1Department of Neurosurgery, Baylor College of Medicine, Houston, Texas 77030, USA. dyoshor@bcm.edu
Journal of Neurosurgery
|January 5, 2008
Summary
Subdural electrodes used for mapping brain function do not hinder local cortical function. Psychophysical testing confirmed no significant impact on visual task performance after electrode implantation.
Area of Science:
- Neuroscience
- Neurophysiology
- Medical Devices
Background:
- Subdural electrodes are standard for mapping brain function.
- The impact of these implants on local cortical function remains unclear.
Purpose of the Study:
- To investigate if uncomplicated subdural electrode implantation affects local cortical function.
- To measure the effect using psychophysical methods.
Main Methods:
- Mapped receptive fields (RFs) using local field potentials in 4 patients with subdural electrodes on the visual cortex.
- Assessed visual orientation change detection performance inside and outside the mapped RFs.
- Generated psychometric curves and analyzed detection thresholds.
Main Results:
- Behavioral data fit logistic functions in all patients.
- No statistically significant differences were found in detection threshold, reaction time, or psychometric function slope.
- Stimuli presented inside or outside the RFs yielded comparable performance.
Conclusions:
- Subdural electrodes for extraoperative monitoring do not impair psychophysical performance.
- These electrodes can be reliably used for accurate regional neurological function assessment.
