The button-sized ecog electrodes don 't penetrate the brain but detect abnormal electrical activity and allow surgeons to locate and remove a small portion of the brain causing the seizures .

纽扣大小的微电极不会穿透大脑，但是能够探测到异常的脑电活动，并且允许外科医生定位并切除导致癫痫发作的一小块脑区。

For patients with severe epileptic seizures uncontrolled by medication , surgeons remove part of the skull and place a silicone mat containing ecog electrodes over the brain for days to weeks while the cranium is held in place but not reattached .

对于那些无法用药物控制的严重癫痫患者，外科医生将他们的部分颅骨切开，在切开的头盖骨被放在原位但并没有重新缝上的时候，在几天到几星期的时间之内医生将含有微电极的硅胶垫植入大脑。

These electrodes are known as microecogs because they are a small version of the much larger electrodes used for electrocorticography , or ecog , developed a half century ago .

这些电极被称为微皮质电极，因为它们是半个世纪之前发展起来的用于皮层脑电图（ecog）记录的大号电极的缩小版。