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Why do people have different responses to the Tritone experiment? If proximity is to be discounted, then what are the factors involved in what seems to be a wide variety of responses?

One thing which Diana Deutsch observed was a certain degree of correlation between orientation of pitch class circle and kinds of speech patterns. For instance, it was noticed that in one subject group, consisting of people who were native to California, there was a consistency of mapping that was almost the exact opposite of that from a group from the south of England. In otherwords, where native Californians heard a sequence as ascending, those from the south of England heard it as descending, and vice versa.

This line of research also began to uncover a correlation of response according to regional differences of speech within the U. S.

Still other research observed a correspondance between the frequency range of a person's voice and orientation with respect to the pitch class circle.