The SAS theory is supported by studies conducted separately in the auditory (Hari, 1995; Hari and Kiesilä, 1996; Helenius, Uutela, & Hari, 1999) and visual (Hari, Renvall, & Tanskanen, 2001; Hari, Valta, & Uutela, 1999) modalities.