A population study of the precedence effect

Data are reported from a population of untrained individuals under lag- and single-click conditions in a discrimination suppression precedence-effect task. The cue to be discriminated was an interaural level-difference (ILD). Each of 91 observers completed 10 runs in a two-interval forced-choice des...

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Bibliographic Details
Published in:Hearing research 2004-05, Vol.191 (1), p.1-13
Main Authors: Saberi, Kourosh, Antonio, Joseph V, Petrosyan, Agavni
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Adolescent
Adult
Audition
Auditory Threshold - physiology
Biological and medical sciences
Dichotic Listening Tests - methods
Discrimination Learning
Discrimination suppression
Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation
Echo
Female
Functional Laterality - physiology
Fundamental and applied biological sciences. Psychology
Humans
Loudness Perception - physiology
Male
Normal Distribution
Observer Variation
Perception
Population
Precedence
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Sex Characteristics
Statistics, Nonparametric
Vertebrates: nervous system and sense organs
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Summary:Data are reported from a population of untrained individuals under lag- and single-click conditions in a discrimination suppression precedence-effect task. The cue to be discriminated was an interaural level-difference (ILD). Each of 91 observers completed 10 runs in a two-interval forced-choice design under a lag-click condition and three runs under a single-click condition. Stimuli were 125-μs rectangular pulses and the interclick interval was 2 ms. Observers were randomly assigned to three groups of approximately 30. Each group was then tested at one stimulus intensity (43, 58, or 73 dB). Mean threshold within each group was greater than 15 dB for the lag-click condition and 6 dB for the single-click condition, although there was substantial interobserver variability. In contrast to [J. Acoust. Soc. Am. 114 (2003) 420] who reported a strong effect of intensity on lag-click ITD discrimination, no effect of intensity was observed on lag-click ILD thresholds. Analysis of over 50,000 near-threshold trials from 302 observers pooled across studies showed a spatial asymmetry in response patterns and a small, but statistically significant effect of gender. A model is proposed which shows that decay of sensory memory and increases in auditory filter bandwidths with intensity may predict the different findings for ILD versus ITD lag-click thresholds.
ISSN:0378-5955
1878-5891
DOI:10.1016/j.heares.2004.01.003