In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 119, No. 5_Supplement ( 2006-05-01), p. 3265-3265
Abstract:
Intensity resolution can be measured by determining the threshold for discrimination of two stimuli differing only in intensity or by determining the threshold for detection of an increment in a longer duration stimulus. Better resolution has been reported for the latter task, but the results are inconsistent across conditions and subjects. In the present study, data were obtained for the two tasks in a range of conditions for 12 adult subjects with normal hearing. Thresholds for intensity discrimination and increment detection were measured for a 4000-Hz tone presented at 20, 40, 60, or 80 dB SPL, using a two-track adaptive procedure that estimated levels required for 71% and 89% correct. The increment was 20, 40, 80, or 160 ms in duration. The pedestal was either the same duration as the increment or was 200 ms longer, centered on the increment. Thresholds expressed in units of delta L were more uniform across subjects and conditions for increment detection than for intensity discrimination. Thresholds were lower on average for increment detection than for intensity discrimination at pedestal levels above 20 dB, but only at the shorter increment durations, and thresholds were not consistently lower for all subjects. [Work supported by R01 DC006648.]
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2006
detail.hit.zdb_id:
1461063-2
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