FIG. 1 is a side elevational view of a unipolar spiral coil electrode for monitoring the electrical activity of the brain, showing our new design, the broken line showing is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a top plan view thereof; and

FIG. 3 is a bottom plan view thereof.

All undisclosed sides of the article are identical to that shown in FIG. 1.