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When listeners know the content of the message they are about to hear, the clarity of distorted or partially masked speech increases dramatically. The current experiments investigated this priming phenomenon quantitatively using a same-different task where a typed caption and auditory message either matched exactly or differed by one key word. Four conditions were tested with groups of normal-hearing listeners: (a) natural speech presented in two-talker babble in a non-spatial configuration, (b) same as (a) but with the masker time reversed, (c) same as (a) but with target-masker spatial separation, and (d) vocoded sentences presented in speech-spectrum noise. The primary manipulation was the timing of the caption relative to the auditory message, which varied in 20 steps with a resolution of 200 ms. Across all four conditions, optimal performance was achieved when the initiation of the text preceded the acoustic speech signal by at least 400 ms, driven mostly by a low number of "different" responses to Same stimuli. Performance was slightly poorer with simultaneous delivery and much poorer when the auditory signal preceded the caption. Because priming may be used to facilitate perceptual learning, identifying optimal temporal conditions for priming could help determine the best conditions for auditory training.

Temporal effects in priming of masked and degraded speech