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Language mapping
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Bipolar stimulation
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Cortical mapping started at low stimulus (1 mA)
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Constant-current generator delivers biphasic square wave
pulses in 4-s trains at 60 Hz across 1 -mm bipolar
electrodes separated by 5 mm
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Stimulation sites marked with sterile numbered tickets
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Throughout motor and language mapping, continuous ECoG used
to monitor after discharge potentials