Abstract
In a recent investigation of temporal gap detection, Eddins, Hall, and Grose observed that gap-detection thresholds were highly dependent on stimulus bandwidth and were relatively independent of stimulus frequency region. The present study investigated the relative importance of these two stimulus variables using an amplitude-modulation detection task. Thresholds for modulation depth were obtained as a function of modulation frequency. The stimulus bandwidth was either 200, 400, 800, or 1600 Hz. The frequency region was varied by adjusting the high-frequency cutoff of the noise which was either 600, 2200, or 4400 Hz. Temporal modulation transfer functions demonstrated the typical low-pass characteristic with modulation thresholds decreasing monotonically with increasing modulation frequency. Neither stimulus bandwidth nor the frequency region of the noise influenced the form of the temporal modulation transfer function, implying that the time constant of the temporal process is essentially the same for all stimulus conditions. Absolute sensitivity to amplitude modulation was better at the larger noise bandwidths. The ability to detect amplitude modulation was essentially the same at 2200 and 4400 Hz and was slightly poorer at 600 Hz.
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