Identification of recording sites. Photomicrograph of a brain section counterstained with HRP-DAB and cytochrome oxidase to highlight the penetration tracks and to aid subnuclei identification (Left panel). In the right panel is the Camera Lucida drawing of the same section with reconstruction of the recording sites. The vertical dark gray lines represent the four electrode tracts and open circles represent the 32 recording sites of the multi-channel Michigan probe. The arrows point to the lesion marks, one in the top left and the other in the bottom right corners of the 4-array recording electrode. ic, internal capscle; RT, reticular thalamic nucleus; VPL, ventroposterior lateral nucleus; and VPM, ventroposterior medial nucleus.