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[Gamma event-related synchronization analysis: a new method for cortical function mapping].

OBJECTIVE
To localize the sensory motor cortex of human brain by analyzing the power change in Gamma band (> 60 Hz) of electrocorticography (ECoG) data.


METHODS
Eight patients with intractable epilepsy underwent temporary placement of subdural electrodes. After surgery, sensory evoked potential (SEP), electrocortical stimulation (CES) and event-related synchronization analysis of Gamma band (Gamma ERS analysis) were performed to reduce the risk of complications. The results of Gamma ERS analysis were compared with those of SEP and CES.


RESULTS
The results of Gamma ERS analysis had 80.7% electrodes fitting perfectly those of CES and SEP. And the percentage reached 92.3% if electrodes were superimposed or added adjacently.


CONCLUSION
The Gamma ERS analysis is a new sensitive and precise method for cortical function mapping.