Discovered by Diana Deutsch in 1973, the octave illusion is an auditory illusion produced by simultaneously playing two sequences of two notes, high to low, and low to high, in separate stereo channels over headphones. People who are right-handed tend to hear the higher pitch as being in their right ear while the results are mixed for left-handed people.
External links
Diana Deutsch's octave illusion page at UCSD (http://psy.ucsd.edu/~ddeutsch/psychology/deutsch_research2.html)
There are physiological illusions, that occur naturally, and cognitive illusions, that can be demonstrated by specific visual tricks that show particular assumptions in the human perceptual system [2].
Paradox illusions offer objects that are paradoxical or impossible, such as the Penrose triangle or impossible staircases seen, for example, in the work of M.
Fiction illusions are the perception of objects that are genuinely not there to all but a single observer, such as those induced by schizophrenia or hallucinogenic drugs.
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