title: Effect of signal-temporal uncertainty in children and adults: tone detection in noise or a random-frequency masker.
abstract: A cue indicating when in time to listen can improve adults' tone detection thresholds, particularly for conditions that produce substantial informational masking. The purpose of this study was to determine if 5- to 13-yr-old children likewise benefit from a light cue indicating when in time to listen for a masked pure-tone signal. Each listener was tested in one of two continuous maskers: Broadband noise (low informational masking) or a random-frequency, two-tone masker (high informational masking). Using a single-interval method of constant stimuli, detection thresholds were measured for two temporal conditions: (1) Temporally-defined, with the listening interval defined by a light cue, and (2) temporally-uncertain, with no light cue. Thresholds estimated from psychometric functions fitted to the data indicated that children and adults benefited to the same degree from the visual cue. Across listeners, the average benefit of a defined listening interval was 1.8 dB in the broadband noise and 8.6 dB in the random-frequency, two-tone masker. Thus, the benefit of knowing when in time to listen was more robust for conditions believed to be dominated by informational masking. An unexpected finding of this study was that children's thresholds were comparable to adults' in the random-frequency, two-tone masker.
authors: Department of Allied Health Sciences, The University of North Carolina at Chapel Hill, CB 7190, Chapel Hill, North Carolina 27599.
authors: Angela Yarnell
authors: AY
authors: Bonino
authors: Department of Allied Health Sciences, The University of North Carolina at Chapel Hill, CB 7190, Chapel Hill, North Carolina 27599.
authors: Lori J
authors: LJ
authors: Leibold
authors: Department of Otolaryngology/Head and Neck Surgery, The University of North Carolina at Chapel Hill, CB 7070, Chapel Hill, North Carolina 27599.
authors: Emily
authors: E
authors: Buss
mesh_terms: D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D002648:Child; D002675:Child, Preschool; D003463:Cues; D006801:Humans; D008027:Light; D009622:Noise / Q000009:adverse effects*; D010470:Perceptual Masking; D010775:Photic Stimulation; D010898:Pitch Perception; D011571:Psychoacoustics; D017603:Signal Detection, Psychological; D013997:Time Factors; D035501:Uncertainty; D014796:Visual Perception; D055815:Young Adult