Directional Perception of Multiple Sound Sources Based on Envelope Cues
نویسندگان
چکیده
In recent years, cochlear implants (CIs) have been successful in restoring the ability in many patients to understand speech in quiet and in acoustically dry environments. However, patients still encounter great difficulties in situations of speech-in-noise or in reverberation. The impact of reflections on perception can be studied in the precedence-effect paradigm which shows the suppression of the influence of a lagging sound on localization of a leading sound. Previous studies have shown that CI-patients rely on interaural level cues (ILDs) for localization while ignoring interaural temporal cues (ITDs) [7]. Since ITDs at low frequencies play an important role for precedence as well as for localization in normal hearing, the goal was to see if the altered cues with CIs carry enough information for precedence. Results with CI-patients show no precedence and two different outcomes: An immediate breakup into two images for short lead-lag delays or the localization of a single image even for longer delays [8]. The purpose of the present study was to investigate the failure of CI-patients to show the precedence effect with a noise-vocoder CI-simulation and normal hearing subjects.
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