Deutsch's scale illusion

Deutsch's scale illusion is an auditory illusion in which two series of unconnected notes appear to combine into a single recognisable melody, when played simultaneously into the left and right ears of a listener.

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.

Right-handers and left-handers differ statistically in how the scale illusion is perceived.

In a clinical study, patients with hemispatial neglect were shown to experience the scale illusion.

Further, in an MEG study on normal listeners the scale illusion was found to be neurally represented at or near the auditory cortex.