| Autor: |
Moore BCJ; Department of Experimental Psychology, University of Cambridge, Cambridge, United Kingdom., Heinz MG; Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, Indiana 47907, USA., Braida LD; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA., Léger AC; Audiology and Deafness Group, University of Manchester, Manchester, United Kingdom. |
| Jazyk: |
angličtina |
| Zdroj: |
The Journal of the Acoustical Society of America [J Acoust Soc Am] 2018 Mar; Vol. 143 (3), pp. 1287. |
| DOI: |
10.1121/1.5025845 |
| Abstrakt: |
Sensitivity to interaural time differences (ITDs) in envelope and temporal fine structure (TFS) of amplitude-modulated (AM) tones was assessed for young and older subjects, all with clinically normal hearing at the carrier frequencies of 250 and 500 Hz. Some subjects had hearing loss at higher frequencies. In experiment 1, thresholds for detecting changes in ITD were measured when the ITD was present in the TFS alone (ITD TFS ), the envelope alone (ITD ENV ), or both (ITD TFS/ENV ). Thresholds tended to be higher for the older than for the young subjects. ITD ENV thresholds were much higher than ITD TFS thresholds, while ITD TFS/ENV thresholds were similar to ITD TFS thresholds. ITD TFS thresholds were lower than ITD thresholds obtained with an unmodulated pure tone, indicating that uninformative AM can improve ITD TFS discrimination. In experiment 2, equally detectable values of ITD TFS and ITD ENV were combined so as to give consistent or inconsistent lateralization. There were large individual differences, but several subjects gave scores that were much higher than would be expected from the optimal combination of independent sources of information, even for the inconsistent condition. It is suggested that ITD TFS and ITD ENV cues are processed partly independently, but that both cues influence lateralization judgments, even when one cue is uninformative. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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