“…The region is important for vision and hearing. Nevertheless, electrophysiological investigations have revealed the presence of cells with an apparently purely somatosensory input in the superior colliculus (Stein, Magalhaes-Castro & Kruger, 1976;Nagata & Kruger, 1979;Bitar, Saade & Banna, 1981;Abrahams, Clinton & Downey, 1988), which is a body notably belonging to the visual system. Likewise, purely somatosensory units have been found in the external nucleus of the inferior colliculus (Aitkin, Dickhaus, Schult & Zimmerman, 1978;Aitkin, Kenyon & Philpott, 1981;Tawil, Saade, Bitar & Jabbur, 1983), which is usually ranged with the auditory system.…”