A Diversity Combination Model Incorporating an Inward Bias for Interaural Time-Level Difference Cue Integration in Sound Lateralization
A sound source with non-zero azimuth leads to interaural time level differences (ITD and ILD). Studies on hearing system imply that these cues are encoded in different parts of the brain, but combined to produce a single lateralization percept as evidenced by experiments indicating trading between t...
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MDPI AG
2020-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/18/6356 |
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| author | Sina Mojtahedi Engin Erzin Pekcan Ungan |
| author_facet | Sina Mojtahedi Engin Erzin Pekcan Ungan |
| author_sort | Sina Mojtahedi |
| collection | DOAJ |
| description | A sound source with non-zero azimuth leads to interaural time level differences (ITD and ILD). Studies on hearing system imply that these cues are encoded in different parts of the brain, but combined to produce a single lateralization percept as evidenced by experiments indicating trading between them. According to the duplex theory of sound lateralization, ITD and ILD play a more significant role in low-frequency and high-frequency stimulations, respectively. In this study, ITD and ILD, which were extracted from a generic head-related transfer functions, were imposed on a complex sound consisting of two low- and seven high-frequency tones. Two-alternative forced-choice behavioral tests were employed to assess the accuracy in identifying a change in lateralization. Based on a diversity combination model and using the error rate data obtained from the tests, the weights of the ITD and ILD cues in their integration were determined by incorporating a bias observed for inward shifts. The weights of the two cues were found to change with the azimuth of the sound source. While the ILD appears to be the optimal cue for the azimuths near the midline, the ITD and ILD weights turn to be balanced for the azimuths far from the midline. |
| first_indexed | 2024-03-10T16:23:06Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T16:23:06Z |
| publishDate | 2020-09-01 |
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| spelling | doaj.art-f8243c72c9a040a4b5ab42bd67e0a4122023-11-20T13:31:15ZengMDPI AGApplied Sciences2076-34172020-09-011018635610.3390/app10186356A Diversity Combination Model Incorporating an Inward Bias for Interaural Time-Level Difference Cue Integration in Sound LateralizationSina Mojtahedi0Engin Erzin1Pekcan Ungan2Department of Biomedical Science and Engineering, Collage of Engineering, Koç University, 34450 Istanbul, TurkeyCollage of Engineering, Koç University, 34450 Istanbul, TurkeyDepartment of Medicine, Koç University, 34450 Istanbul, TurkeyA sound source with non-zero azimuth leads to interaural time level differences (ITD and ILD). Studies on hearing system imply that these cues are encoded in different parts of the brain, but combined to produce a single lateralization percept as evidenced by experiments indicating trading between them. According to the duplex theory of sound lateralization, ITD and ILD play a more significant role in low-frequency and high-frequency stimulations, respectively. In this study, ITD and ILD, which were extracted from a generic head-related transfer functions, were imposed on a complex sound consisting of two low- and seven high-frequency tones. Two-alternative forced-choice behavioral tests were employed to assess the accuracy in identifying a change in lateralization. Based on a diversity combination model and using the error rate data obtained from the tests, the weights of the ITD and ILD cues in their integration were determined by incorporating a bias observed for inward shifts. The weights of the two cues were found to change with the azimuth of the sound source. While the ILD appears to be the optimal cue for the azimuths near the midline, the ITD and ILD weights turn to be balanced for the azimuths far from the midline.https://www.mdpi.com/2076-3417/10/18/6356interaural time differenceinteraural level differencesound lateralizationdiversity combination |
| spellingShingle | Sina Mojtahedi Engin Erzin Pekcan Ungan A Diversity Combination Model Incorporating an Inward Bias for Interaural Time-Level Difference Cue Integration in Sound Lateralization Applied Sciences interaural time difference interaural level difference sound lateralization diversity combination |
| title | A Diversity Combination Model Incorporating an Inward Bias for Interaural Time-Level Difference Cue Integration in Sound Lateralization |
| title_full | A Diversity Combination Model Incorporating an Inward Bias for Interaural Time-Level Difference Cue Integration in Sound Lateralization |
| title_fullStr | A Diversity Combination Model Incorporating an Inward Bias for Interaural Time-Level Difference Cue Integration in Sound Lateralization |
| title_full_unstemmed | A Diversity Combination Model Incorporating an Inward Bias for Interaural Time-Level Difference Cue Integration in Sound Lateralization |
| title_short | A Diversity Combination Model Incorporating an Inward Bias for Interaural Time-Level Difference Cue Integration in Sound Lateralization |
| title_sort | diversity combination model incorporating an inward bias for interaural time level difference cue integration in sound lateralization |
| topic | interaural time difference interaural level difference sound lateralization diversity combination |
| url | https://www.mdpi.com/2076-3417/10/18/6356 |
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