![]() ![]() As the barber “moves” to your right, the volume increases slightly in the right channel and decreases in the left. Listening to it, you feel as though you are in a barber’s chair, with the barber moving around you, clipping away at your hair. This is a demonstration of the stereo effect. This note was once considered to be evil and was not used in music until modern times.1 Barber’s shop illusion (Listen with headphones) This experience can be particularly astonishing to a group of musicians who are all quite certain of their judgments, and yet disagree completely as to whether such a pair of tones is moving up or down in pitch. But other people, on listening to the identical pair of tones, hear a descending pattern instead. When one tone of a pair is played, followed by the second, some people hear an ascending pattern. The basic pattern that produces this illusion consists of two computer-produced tones that are related by a half-octave. As people get older they lose the ability to hear higher-pitched sounds – that is the reason that only young people can hear this sound – it is too high for most people over the age of 20. It is also occasionally used in England to play very loud in areas that authorities don’t want teens to congregate in, as the noise annoys them. This sound is used by some teenagers as a ringtone on their mobile phones so that only they (and others of their age group) can tell when the phone is ringing. ![]() This is a sound that can only be heard by people under 20 (some over 20 can hear it but not many) – it is a sine wave at 18,000 Hz (by comparison, a dog whistle sounds at 16,000 – 22,000 HZ – meaning your dog can hear this “under the 20s” sound as well). If you want to hear “Welfare” then it is ‘Welfare’ you hear otherwise it’s “Farewell”. What you hear is what you concentrate on hearing. Pairs of chords sound as if they are advancing up the scale, and when looped, it sounds like an auditory equivalent to M. This is a demonstration of Shepard’s Paradox, an audio illusion synthesized by Jean-Claude Risset. Right-handed people tend to hear the high melody in the right ear, and the low one in the left, while left-handers show a more diverse response. In other words, the brain reassigns some of the notes to a different ear in order to make a coherent melody. Rather than hearing the two scales, people hear a descending and re-ascending melody in one ear, and an ascending and descending melody in the other. There are several ways in which people perceive these sounds, but the most common is to group the high and low notes together. However, the notes alternate from ear to ear – for instance, the right ear hears the first note of one scale, and then the second note of the other. Two major scales are played: one ascending, and one descending. This illusion was discovered by Diana Deutsch and is an example of our brains “grouping” similar notes together. The illusion demonstrates our ability to locate sounds in space by comparing the inputs to the two ears, we can work out where a sound is coming from. Similarly, increases in the volume of sound from the clippers give the impression that he is bringing them closer and closer to each ear. ![]() ![]() At the higher speed, the changing notes linger in your perception long enough to be linked into a melody, but at the lower speeds, they’re too widely separated. The melody disappears if the piece is played slowly.Ĭompare these recordings of Christian Sinding’s Frühlingsrauschen (“Rustle of Spring”). If they’re playing fast enough, the brain picks up on the occasional notes that change, and links them together to form a melody. Some pieces of music consist of high-speed arpeggios or other repeating patterns, which change only subtly. It’s so realistic that you really feel an invisible/virtual matchbox moving around your body. In this illusion, a shaking matchbox is moved around your entire body. The increase in tempo can be felt if the sample is looped in an audio player. A drumbeat sounds as if it is quickening in tempo, but the starting tempo is the same as the finishing tempo. The illusion can be felt if the sample is looped in an audio player. This reveals that the start pitch is obviously much lower than the finishing pitch. If you loop this sample you will clearly see the pitch jump back down when the sample repeats. As they fall their pitch seems to be getting lower, but in fact, the pitch gets higher. This is a recording of a paradox where bells sound as if they are falling through space. ![]()
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