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- W2000699197 abstract "Psychophysical experiments on amplitude-modulation (AM) masking suggest the existence of channels selectively sensitive to different ranges of modulation rates. This study investigates whether tuning depends on carrier level. Masking of a 40-Hz signal AM was measured as a function of the masker-AM rate selected from the range between 4 and 256 Hz, for Gaussian-noise and 5.5-kHz carriers. For the noise carrier, similar patterns were observed at two different spectrum levels (25 and 40 dB SPL), leading to similar estimates of the modulation-filter bandwidths. For the tonal carrier, however, tuning in AM masking varied considerably across levels. At the lowest level tested (40 dB SPL), the patterns were very broad and highly asymmetric. The patterns became more similar across carrier levels when a highpass noise was presented with the carrier. The noise limited the use of spread of excitation and thus, raised thresholds for the unmasked signal detection. The data suggest that the AM selectivity is strongly affected by the detection threshold for the unmasked AM. [Work supported by NIH grants DC00683 and DC006804.]" @default.
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- W2000699197 date "2005-04-01" @default.
- W2000699197 modified "2023-09-24" @default.
- W2000699197 title "Level effects in amplitude modulation tuning" @default.
- W2000699197 doi "https://doi.org/10.1121/1.4788416" @default.
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