Deutsch's scale illusion
Discovered by Diana Deutsch,
Deutsch's scale illusion is an
auditory illusion produced by simultaneous ascending and descending major scales beginning in separate
stereo channels with each succesive note being switched to the opposite channel. With the left channel: C'-D-A-F--A-D-C'; and the right: C-B-E-G-E-B-C; the ear hears both: C'-B-A-G--A-B-C'; and: C-D-E-F--E-D-C. Two complex patterns are turned into two much simpler patterns.