Signal–noise duration, psychophysical procedure, interaural configuration, and the psychometric function

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Abstract
Effects on locations and slopes of psychometric functions are reported for 2IFC and YN tasks as a function of the duration (particularly 10–125 msec) of synchronously gated tone bursts (400 Hz) and noise bursts (broad-band, Gaussian) under homophasic (NOSO) and antiphasic (NOSπ) listening conditions. Emphasis is placed on the finding that slopes are consistently lower at 10 msec as opposed to 125 msec for synchronously gated tone and noise, and the effect is not dependent on either psychophysical procedure or interaural configuration. Published results for continuous noise maskers suggest that such a duration dependency does not appear. Slopes do not seem to be affected by either interaural configuration, psychophysical procedure, or masker continuity condition for 125-msec signals. Large threshold increases occur at the short duration only under YN listening, and are largest for NOSπ. The nature of combined threshold and slope shifts may be incompatible with existing detection theories. Subject Classification: 65.60, 65.58, 65.75; 50.70.

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