Abstract
To find the physiological basis of auditory effects of loudness enhancement and deteriorated the intensity discrimination of tone bursts unmasked and masked by noise bursts, the response of an ensemble of peripheral fiber models is simulated. The response of the ensemble to a single presentation of tone bursts is given in the form of two complementary distributions: the probability distribution of the occurrence of spikes in time and the distribution of interspike intervals. In response to tone bursts, such distributions have narrow excitation ranges. For single bursts, the sums of spikes and interspike intervals in the excitation regions could be a basis for forming independent “basic” and “complementary” components of tone burst loudness. The sums of spikes in two regions of the first distribution in response to a pair of bursts could be a basis of “basic” loudness components of bursts of the pair. The sum of interspike intervals in the first excitation region of the second distribution combined intervals comparable with durations of each of the bursts of the pair and could therefore form a basis for the “complementary” component of loudness of the pair. The sum of interspike intervals in the second excitation region combined intervals comparable to the delay of the second tone burst with respect to the first and could be responsible for the periodicity of the pair. The magnitude of the complementary loudness component of the pair depended on the intensity and duration of tone bursts of the pair, not on the positions and delays of these tone bursts. Taking into account the basic and complementary loudness components made it possible to explain the well-known effects of increasing loudness and deteriorated discrimination of the intensity of individual and masked tone bursts. Specially performed auditory experiments demonstrate that discrimination of the intensity of masked tone bursts (probably due to the influence of the complementary component of loudness of the pair) depends on the ratio of tone burst intensities in the pair, not on the positions and delays of the tone bursts with respect to each other.
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Rimskaya-Korsakova, L.K. Different Distributions of the Peripheral Fibers Ensemble Activity in the Formation of Loudness and Intensity Discrimination of Tone Bursts unmasked and masked by Noise Bursts. Acoust. Phys. 67, 661–674 (2021). https://doi.org/10.1134/S1063771021060063
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DOI: https://doi.org/10.1134/S1063771021060063