APA Dictionary of Psychology

n. (pl. colliculi) a small elevation. Two pairs of colliculi are found on the dorsal surface of the midbrain. The rostral pair, the superior colliculi, receive and process visual information and help control eye movements; they are also thought to have a role in blindsight. The caudal pair, the inferior colliculi, receive and process auditory information. [from Latin, “small hill”]