Estimates of Temporal Resolution at Low and High Spectral Frequencies

Abstmcti Amplitud&modtiation dektion w measured as a fmction of modulation frequency for narrowband noise carriers and the resulting temporal modulation transfer functions were used to characterize temporal acuity over a range of audio frequencies hm 800 to 12800 W. Systematicmanipulations of carrier upper+utoff frequency produced estimates of temporal acuity that did not vary from 800 to 12800 W. k the first of two experiments, the amplitude modulated noise bands were filtered afier modulation to control for potential spectral cues. The resulting estinu~tes of tempond acuity decreased with inmeasing der bandtidth. h the second experiment, the standard stimulus was a quasi-frequency modulated (QW noise and the signal was an tilltered, amplitude-modulated noise. With these stimuli, estimates of temporal acuity were independent of carrier bandwidth. These results are consistent with a grotig body of evidence demonstrating estimates of auditory temporal acuity that are constant throughout most of the audible spectrum.