Deutsch and Clarkson have suggested that pitch control corrections made by subjects attempting to sing a fixed frequency occur about 10 times/s, i.e. much faster than those found in other perceptual-motor tasks. This evidence was evaluted using the technique of delayed auditory feedback, with delay intervals of up to 120 ms. A distinction was made between an explanation in which control corrections are applied on every half cycle of the vibrato, as Deutsch and Clarkson suggested, and one in which the output is sampled over a longer period before any control correction is imposed. There was no indication that exceptionally fast control corrections can be made in vocal pitch regulation.
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