FIG. 1. Representative brain lesions. Transverse brain sections at levels +3.0, +4.0 and +5.0 of the thalamus are shown for four rats in which boxing was abolished following the lesion and facial anesthesia. Complete destruction is indicated by black, while extensive neuronal damage and gliosis is indicated by stipple. Drawings are taken from atlas of Pellegrino and Cushman [9].