Detection threshold microstructure and its effect on temporal integration data

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Abstract
Auditory detection thresholds [human] were measured at several preselected frequencies using an adaptive 2IFC [2 interval forced choice] procedure. Results confirm the existence of shifts in detection threshold ranging from 2-14 dB with quite small changes in signal frequency. There does not appear to be a uniform pattern associated with the microstructure of the detection threshold curve. An additional experiment was performed to determine the effect of signal duration on detection threshold microstructure. The temporal integration function seems considerably steeper for more sensitive frequencies (3.7 dB/doubling of duration), than for less sensitive frequencies (1.7 dB/doubling). This is probably not due to differences in processing as much as it is to the effect of the energy spread associated with decreasing signal duration.

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