Abstract
This study continues the investigation of factors influencing the effective use of an informational cue. The observer's task was to perform a monaural yes—no detection task with a 0.5 probability of a signal event (a 100-msec sinusoid in continuous Gaussian noise whose frequency was chosen randomly from an ensemble of eight frequencies). On each trial, a 300-msec contralateral cue matching the signal frequency was provided. The observer was encouraged to use this cue to reduce the effects of the existent signal frequency uncertainty. When the starting time of the cue relative to the signal event was varied across experimental conditions: (1) Given a sufficiently long interstimulus interval, the cue could be effectively utilized whether placed before or after the signal event. (2) A cue presented before the signal event produced a larger improvement in performance than a cue presented after the signal event. (3) A cue presented with a small interstimulus interval produced substantial decrements in detection performance.
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