Auditory illusions Auditory illusions An auditory illusion is an illusion of hearing, the sound equivalent of an optical illusion: the listener hears either sounds which are not present in the stimulus, or "impossible" sounds. In short, audio illusions highlight areas where the human ear and brain, as organic, makeshift tools, differ from perfect audio receptors (for better or for worse). ...more on Wikipedia about "Auditory illusion"
The Deutsch tritone paradox is an auditory illusion created by Diana Deutsch (creator of a number of auditory illusions) to test the Shepard scale if proximity information was removed. Thus two Shepard tones exactly half an octave apart, a tritone, are played. Diana Deutsch found that perception of which tone was higher was dependent on the absolute frequencies involved: one will consistently find the same tone as higher or lower, and this is determined by the tones' absolute pitch. This is consistently done by a large portion of the population, despite the fact that responding differently to different tones must involve the ability to hear absolute pitch, which was thought to be extremely rare. Deutsch also found that British and Californian subjects consistently resolved the ambiguity the opposite way. ...more on Wikipedia about "Deutsch tritone paradox"
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 successive 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. Using headphones, right handers tend to hear the higher melody on the right and the lower melody on the left; however, left handers, as a group, ...more on Wikipedia about "Deutsch's scale illusion"
The glissando illusion was first reported and demonstrated by Diana Deutsch in Musical Illusions and Paradoxes, 1995. An auditory illusion, it is created when a sound with a fixed pitch, such as a synthsized oboe tone, is played together with a sine wave gliding up and down in pitch, and they are both switched back and forth between stereo loudspeakers. The effect is that the oboe is heard as switching between loudspeakers while the sine wave is heard as joined together seamlessly, and as moving around in space in accordance with its pitch motion. Righthanders often hear the glissando as traveling from left to right as its pitch glides from low to high, and then back from right to left as its pitch glides from high to low. Lefthanders often obtain different illusions. ...more on Wikipedia about "Glissando illusion"
The illusory continuity of tones is the auditory illusion caused when a tone is interrupted for a short time (approximately 50ms or less), during which a narrow band of noise is played. Whether the tone is of constant, rising or decreasing pitch, the ear perceives the tone as continuous if the 50ms (or less) discontinuity is masked by noise. Because the human ear is very sensitive to sudden changes, however, it is necessary for the success of the illusion that the amplitude of the tone in the region of the discontinuity not decrease or increase too abruptly. ...more on Wikipedia about "Illusory continuity of tones"
The McGurk effect is a perceptual phenomenon which indicates an interaction between hearing and vision in speech perception. It suggests that speech perception is multimodal; it involves information from more than one sensory modality. The McGurk effect is sometimes called the McGurk-MacDonald effect. ...more on Wikipedia about "McGurk Effect"
Discovered by Diana Deutsch in 1973, the octave illusion is an auditory illusion produced by simultaneously playing two sequences of two notes that are spaced an octave apart, 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. ...more on Wikipedia about "Octave illusion" My way is www.shortopedia.com shortopedia
A Shepard tone is a sound consisting of a superposition of tones separated by octaves. When played with the base pitch of the tone moving upward or downward, it is referred to as the Shepard scale. This creates the auditory illusion of a tone that continually ascends or descends in pitch, yet which ultimately seems to get no higher or lower. This can be constructed by creating a series of overlapping ascending or descending scales. Similar to the Penrose stairs optical illusion (as in M.C. Escher's Ascending and Descending) or a barber's pole, the basic concept is shown in this illustration: ...more on Wikipedia about "Shepard tone"
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