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Precedence-effect thresholds for a population of untrained listeners as a function of stimulus intensity and interclick interval

Saberi, Kourosh and Antonio, Joseph V. (2003) Precedence-effect thresholds for a population of untrained listeners as a function of stimulus intensity and interclick interval. Journal of the Acoustical Society of America, 114 (1). pp. 420-429. ISSN 0001-4966. doi:10.1121/1.1578079.

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Data are reported from 127 untrained individuals under lag- and single-click conditions in a precedence-effect task. In experiment I, each subject completed ten runs in a two-interval forced-choice design under a lag-click condition and three runs under a single-click condition. The cue to be discriminated was an interaural time difference (ITD). Stimuli were 125-μs rectangular pulses and the interclick interval (ICI) was 2 ms. Subjects were randomly assigned to three groups of approximately 30. Each group was tested at one stimulus intensity (43, 58, or 73 dB). Mean threshold within each group was greater than 500 μs for lag-click ITD conditions, although substantial intersubject variability and a clear effect of stimulus intensity on lag-click ITD thresholds were observed, with lower thresholds for higher intensities. In experiment II, the ICI was varied from 0.3 to 10 ms, and thresholds were obtained from groups of approximately 20 untrained subjects. Data were also collected from three highly experienced observers as a function of ICI. The best naı̈ve subject produced mean thresholds near, but not as low as those obtained from experienced subjects. Analysis of adaptive-track patterns revealed abrupt irregularities in threshold tracking, consistent with either losing the cue or listening to the wrong cue in an ambiguous stimulus.

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Additional Information:© 2003 Acoustical Society of America. (Received 12 September 2001; revised 2 April 2003; accepted 4 April 2003) This work was supported by a Grant from the National Institutes of Health (DC-03648). We thank Dr. David R. Perrott, Dr. Pat Zurek, Agavni G. B. Pertosyan, Kyle Nakamoto, and Prisilia Tirtabudi for helpful comments.
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Issue or Number:1
Classification Code:PACS numbers: 43.66.Pn, 43.66.Mk, 43.66.Qp
Record Number:CaltechAUTHORS:20170408-154553585
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76062
Deposited By: 1Science Import
Deposited On:23 May 2017 20:16
Last Modified:15 Nov 2021 16:57

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