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- W2079072255 abstract "This paper describes two experiments intended to test excitation-pattern models of frequency discrimination. In experiment I, frequency DLs (DLFs) for pulsed sinusoids were measured in four conditions: (1) in quiet with the level fixed at 70 dB SPL; (2) in quiet with the level of each tone varied randomly over a 6-dB range around 70 dB SPL; (3) in the presence of a bandpass noise designed to mask the upper side of the excitation pattern, with the level fixed; and (4) with bandpass noise and with the level of the signal randomized over a 6-dB range. Center frequencies of 0.5, 1.0, 2.0, 4.0, and 6.5 kHz were used. DLFs for conditions 3 and 4 were somewhat larger than DLFs for conditions 1 and 2, indicating that frequency discrimination is not based solely on information from the low-frequency side of the excitation pattern. DLFs for condition 4 were, on average, 1.65 times as large as those for condition 1 but, except at 6.5 kHz, were considerably smaller than the values predicted on the assumption that the DLFs were based on the detection of changes in excitation level on the low-frequency side of the excitation pattern. It is suggested that phase-locking information plays a role in determining DLFs at 4.0 kHz and below. Experiment II was similar to experiment I, except that thresholds (FMDLs) for detecting frequency modulation (FM) at a 4-Hz rate were measured, and, in conditions 2 and 4, a 4-Hz amplitude modulation (AM) with a peak-to-valley ratio of 6 dB was imposed on all signals; the phase of the AM relative to the FM was random. The FMDLs were affected more by the noise and by the variation in level than were the DLFs; FMDLs for condition 4 were, on average, 2.36 times as large as those for condition 1. Furthermore, the data for condition 4 were not inconsistent with the assumption that the FMDLs were based on the detection of changes in excitation level on the low-frequency side of the excitation pattern. However, neither a single-band nor a multiple-band excitation-pattern model was able to account for the effect of the bandpass noise on the FMDLs." @default.
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- W2079072255 date "1989-11-01" @default.
- W2079072255 modified "2023-10-13" @default.
- W2079072255 title "Mechanisms underlying the frequency discrimination of pulsed tones and the detection of frequency modulation" @default.
- W2079072255 doi "https://doi.org/10.1121/1.398603" @default.
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