Dependence of (NoSπ)τ detection thresholds on noise statistics and its implication for binaural modeling
| Autor: | van de Par, Steven, Bernstein, Leslie R., Trahiotis, Constantine, Kohlrausch, Armin |
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| Přispěvatelé: | Caclin, Anne, Gaudrain, Etienne, Grimault, Nicolas, Lavandier, Mathieu, Micheyl, Christophe, Tamissa-Léger, Florence |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| DOI: | 10.5281/zenodo.6576889 |
| Popis: | An interaurally out-of-phase tone added to a diotic narrow-band noise can be detected based on the interaural cues it creates. Accounts for such NoSπ detection thresholds have been made based on cross-correlation models, Equalization Cancellation models, and on models that evaluate the fluctuations of interaural phase differences (IPDs) caused by the addition of the signal. When the complete NoSπ stimulus is interaurally delayed [referred to as (NoSπ)τ], detection thresholds have been found to increase gradually. In cross-correlation-based models this is attributed to the ability to evaluate the interaural cross correlation at a compensatory delay which has increased internal noise. At the same time, accounts based on IPD processing also predict increased detection thresholds with increasing delays of the (NoSπ)τ stimulus. This results from variations in instantaneous frequency of the delayed narrow-band noise alone which will convert the applied constant time delay into fluctuating IPDs. The goal of the present study was to contribute new data that may have the potential to distinguish between the competing approaches for modeling binaural detection. The main idea was to perform binaural detection experiments for noise maskers with highly different statistics which affect the statistics of the discussed binaural detection cues in different ways. In this study we present data obtained with three different types of noise maskers centered at 500 Hz and having a bandwidth of 80 Hz. Those maskers differ in terms of both their instantaneous frequency and their envelope properties. Binaural detection was measured using the (NoSπ)τ configuration with 11 values of τ ranging from 0 to 3 ms. Gaussian noise, single-multiplied noise, and low-noise noise were employed. Assuming cross-correlation based detection the change in correlation as a function of signal level would be highly similar for all three masker types. In contrast, strong differences exist in the distribution of IPDs when an interaural delay in the stimulus is introduced. Results showed that a cross-correlation based model yielded predictions that corresponded quite well with the behavioral thresholds. In contrast, similar success in accounting for the behavioral data was not observed when a model based on IPD distributions was employed. The data and results presented herein, promise to foster the discovery of additional stimulus manipulations and analyses allowing for critical testing of different types of models designed to account quantitatively for binaural auditory processing. Funding:Deutsche Forschungsgemeinschaft: 397774634Office of Naval Research: ONR N00014-18-1-2437 |
| Databáze: | OpenAIRE |
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