Abstract
A two‐interval forced‐choice adaptive tracking procedure was used to estimate the frequency difference limen (DL). In one condition, the frequency of the standard tone was constant for every trial with the frequency of the comparison tone varied according to the adaptive procedure. The interval between standard and comparison stimuli (ISI) was fixed. In contrast to this “fixed‐standard fixed‐ISI” condition, other conditions were tested in which the standard frequency and/or the ISI were chosen on each trial according to pseudo‐random algorithms. The results indicate that the frequency DL may increase by as much as a factor of 2 for some roving‐standard and random ISI conditions. In addition, a trial‐by‐trial record of each run was used to assess discrimination performance as a function of frequency and ISI. The decay of the sensory trace with increasing ISI, and uncertainty about signal frequency and timing appear to account for the changes in discrimination. [Supported by NIH.]
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