Variation in Pitch Discrimination Within the Tonal Range
Variation in Pitch Discrimination Within the Tonal Range
Thomas Franklin Vance
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With tuning forks, it is impossible to produce as satisfactory a tone at the extremes as in the central register. Discrimination of pitch at 64 and at 2048 v. D. Is thus made most difficult and the observer has a tendency to pick up other criteria than pitch upon which to base his judgments. Differences of intensity, change in the direction of the source of sound, and noises accompanying the control of the experiment are the chief factors which cause distur- bance. They lead to confusion, rathe...r than to identification, because the method used necessitated their approximately equal distribution between the higher and the lower tones ; that is to say, that they occurred in a chance order, were therefore unpredictable, and con- sequently could not be used as safe criteria for accurate judg- ments; for example, if an observer was inclined to judge the more intense tone the higher, there would be an increased probability of error whenever the lower tone happened to be more intense. Had the forks been energized by a mechanical device, rather than by the free hand, these variables would have been constant and would have become a means of identification, rather than a source of confusion.
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