Selective adaptation to linear frequency-modulated sweeps: Evidence for direction-specific FM channels?

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Abstract
Psychometric functions were obtained for detection of linear EM pure tones which were preceded by either a pure tone or a linear FM pure-tone adaptor. The results of Gardner of Wilson (1979) were generally confirmed: thresholds were larger by about a factor of 1.7 when the adaptor and test sweeps rose in frequency. This increase in threshold corresponds to a change in performance from 75-65% correct. As an alternative to feature-selective channels, this small effect may be due to nonsensory factors, specifically, the use of an adaptor-like reference in the adapted condition. Performance similar to that obtained in humans is shown by an ideal receiver that uses an inappropriate reference to match the signal in the detection task.

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