Vanilla is a product of Lussumo:Documentation and Support.
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Why do people orient their maps of the pitch class circle in different ways? Deutsch conjectured that the answer might lie in the speech patterns that we hear....So on the basis of these observations, Deutsch (1991) compared two groups of subjects. Those in the first group had grown up in California, and those in the second group had grown up in the south of England. These two groups tended to differ in how they heard the tritone paradox: Frequently when a Californian subject heard a pattern as ascending, a subject from the south of England heard the identical pattern as descending, and vice versa.