Intraoperative functional mapping is an integral facet of many suprate
ntorial procedures involving cortical resection. A new device is descr
ibed that can be used in conjunction with a standard cortical stimulat
or and strip electrodes to stimulate intraoperative regions of unexpos
ed cerebral cortex. This permits the use of a smaller craniotomy, whil
e providing the ability for functional mapping of large areas of surfa
ce cortex.