Abstract
Several models predict tight coupling between loudness growth and intensity resolution performance. To examine further the link between these measures, intensity resolution performance and loudness growth for a 1000-Hz tone were measured in the presence of a unilateral, continuous, high-pass noise (cutoff: 1800 Hz). Thresholds for the three subjects were minimally effected at the test frequency; however, for frequencies in the noise passband, thresholds were shifted to roughly 60 dB SPL. Intensity resolution was measured for gated and continuous standards using a 3-AFC procedure. Loudness matches were obtained using the contralateral ear as a reference. Below roughly 40 dB SPL, loudness growth and intensity resolution were unaltered by the presence of the noise; above 40 dB SPL, intensity resolution performance was well described by Weber’s law (gated standard) or by a slight deterioration in performance (continuous standard) while loudness growth became slower. The results will be described in terms of current models for relating these measures.
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