Spoken narrative comprehension for young adult listeners: effects of competing voices and noise.

Objective: To examine the influence of competing voices or noise on the comprehension of spoken narratives for young adults.
Design: First, an intelligibility assessment of the target narratives was conducted to establish a signal-to-noise ratio ensuring accurate initial speech recognition. Then, narrative comprehension for two target types ( fixed and varied target talker ) was measured in four listening conditions ( quiet, one-talker speech, speech babble, speech-shaped noise ). After hearing target narratives in each listening condition, participants completed a visual recognition memory task that assessed the comprehension of the narrative materials at three levels of representation ( surface form, propositional, event model ).
Study Sample: Seventy adults (18-32 years of age).
Results: Narrative comprehension results revealed a main effect of listening condition at the event model level, indicating poorer narrative memory of described situations for all noise conditions compared to quiet. Increased positive responses to thematically consistent but situationally "wrong" memory probes drove this effect. No other significant effects were observed.
Conclusion: Despite near-perfect speech recognition, background noise negatively influenced aspects of spoken narrative comprehension and memory. Specifically, noise did not disrupt memory for what was said (surface form and propositional memory), but only memory for what was talked about (event model memory).