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Random Gap Detection Test : A Useful Measure of Auditory Ageing ?

Introduction Older listeners often perform poorly on tasks of speech understanding in noisy and reverberant listening conditions. It has been suggested that deficits in temporal resolution and in the precedence effect may be responsible for this difficulty [1], with gaps between sounds becoming less distinct with age. Temporal resolution is defined as “the ability of the auditory system to respond to rapid changes in the envelope of a sound over time” [2], and gap-detection paradigms measure a key aspect of this ability. They assess the smallest time interval between two stimuli that can be detected either cortically or at the level of the brainstem. In the normal hearing population, psychoacoustic gap detection thresholds are typically between 2 and 20 milliseconds (ms) [3]. One commercially available test for the assessment of gap detection ability is the Random Gap Detection Test (RGDT) [4].