Abstract
This study investigated temporal and spectral influences in a task used to investigate the bandwidths of phase sensitivity. Subjects discriminated amplitude modulated (AM) tones and quasi-frequency modulated (QFM) tones in a 2IFC. An adaptive threshold procedure was used to estimate modulation depth needed to make the discrimination as a function modulation frequency for a 2000-Hz carrier. Threshold functions were often nonmonotonic, with nonmonotonicities observed at higher-modulation frequencies. This is likely due to the effects of distortion products creating salient spectral cues. When stimulus duration is decreased from 200 to 50, 20, or 10 ms, thresholds for low-modulation frequencies decreased to near-chance levels, whereas thresholds in the region of nonmonotonicities were largely unaffected. The decrease in stimulus duration appears to hinder the listener’s ability to use temporal cues in order to discriminate between AM and QFM, whereas spectral information derived from distortion product cues appears to be resilient. [Work supported by NSF BCS-07464003.]
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