Abstract
Performance in a simultaneous two-frequency detection task was studied under monaural and dichotic conditions of signal presentation. In the basic task a 630-Hz tone, a 1400-Hz tone, neither tone, or both tones occurred with equal likelihood on an experimental trial. The observer had to specify which of these events had occured. Performance was examined: (a) when the signal could occur only in the right earphone channel, and (b) when the 630- and 1400-Hz signals were confined, respectively, to the left and right earphone channels. Single-frequency comparison conditions were also run. A performance decrement was observed in both of the two-frequency conditions compared to the single-frequency condition. However, there was no consistent difference between the monaural and dichotic two-frequency conditions. An analysis of the conditional detection probabilities revealed the presence of a cross-frequency interference effect on trials when a signal was present at the other frequency. This effect was sufficient to account for the differences between single-frequency and two-frequency detection performance.
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