Abstract
This study investigated monaural and binaural differences in a task traditionally used to investigate the bandwidths of phase sensitivity. Subjects discriminated amplitude modulated (AM) tones and quasi-frequency modulated (QFM) tones presented diotically. 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 (above 600 Hz). This is likely due to the effects of cubic difference tones (CDTs) creating spectral cues, yielding lower thresholds. Subjects then completed the task at higher modulation frequencies monotically, demonstrating differences between monotic and diotic thresholds. Within subject thresholds also differed between left ear and right ear presentations. Some subjects yield nonmonotonic thresholds in the monotic condition, even when diotic thresholds were monotonic. For these subjects, it is likely that the CDT interaction is not consistent between the two ears, rendering them an unusable cue when stimuli are presented diotically. Distortion product otoacoustic emissions (DPOAEs) were measured and support the hypothesis that nonmonotonicities found are the effect of a CDT interacting with the low tone of the stimulus.
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