revision preference src: In his early work on animal subjects, Sperry made many noteworthy discoveries. The results of these studies over the next thirty years later led to Roger Sperry being awarded the Nobel Prize in Physiology or Medicine in 1981. <SEP> tgt: In his early work on animal subjects, Sperry made many noteworthy discoveries. The results of these studies over the next thirty years later led to Sperry being awarded the Nobel Prize in Physiology or Medicine in 1981.