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Speech intelligibility in rooms: Disrupting the effect of prior listening exposure.

It has been demonstrated that prior listening exposure to reverberant environments can improve speech understanding in that environment. Previous studies have shown that the buildup of this effect is brief (less than 1 s) and seems largely to be elicited by exposure to the temporal modulation characteristics of the room environment. Situations that might be expected to cause a disruption in this process have yet to be demonstrated. This study seeks to address this issue by showing what types of changes in the acoustic environment cause a breakdown of the room exposure phenomenon. Using speech carrier phrases featuring sudden changes in the acoustic environment, breakdown in the room exposure effect was observed when there was change in the late reverberation characteristics of the room that signaled a different room environment. Changes in patterns of early reflections within the same room environment did not elicit breakdown. Because the environmental situations that resulted in breakdown also resulted in substantial changes to the broadband temporal modulation characteristic of the signal reaching the ears, results from this study provide additional support for the hypothesis that the room exposure phenomenon is linked to the temporal modulation characteristics of the environment.