Speech-in-Speech Recognition and Spatially Selective Attention in Children and Adults.

Purpose Knowing target location can improve adults' speech-in-speech recognition in complex auditory environments, but it is unknown whether young children listen selectively in space. This study evaluated masked word recognition with and without a pretrial cue to location to characterize the influence of listener age and masker type on the benefit of spatial cues. Method Participants were children (5-13 years of age) and adults with normal hearing. Testing occurred in a 180° arc of 11 loudspeakers. Targets were spondees produced by a female talker and presented from a randomly selected loudspeaker; that location was either known, based on a pretrial cue, or unknown. Maskers were two sequences comprising spondees or speech-shaped noise bursts, each presented from a random loudspeaker. Speech maskers were produced by one male talker or by three talkers, two male and one female. Results Children and adults benefited from the pretrial cue to target location with the three-voice masker, and the magnitude of benefit increased with increasing child age. There was no benefit of location cues in the one-voice or noise-burst maskers. Incorrect responses in the three-voice masker tended to correspond to masker words produced by the female talker, and in the location-known condition, those masker intrusions were more likely near the cued loudspeaker for both age groups. Conclusions Increasing benefit of the location cue with increasing child age in the three-voice masker suggests maturation of spatially selective attention, but error patterns do not support this idea. Differences in performance in the location-unknown condition could play a role in the differential benefit of the location cue.