Audiology & neuro-otology · 2026
Effects of Interaural Timing Delays on Speech Perception in Noise in Bilateral Cochlear Implant Users.
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Zelger Philipp, Raffelsberger Tobias, Franke-Trieger Annett, Keintzel Thomas, Schmutzhard Joachim, Muigg Franz, Rungger Markus, Seebacher Josef
Аннотация
INTRODUCTION: Precise interaural timing and level cues are critical for spatial hearing and speech understanding in noise. Bilateral cochlear implant (CI) users provide a controlled model to investigate how artificially introduced interaural timing disparities affect binaural hearing. This study investigates whether introducing a unilateral time delay in CI stimulation affects speech perception in noise and spatial release from masking (SRM).
METHODS: Eleven bilateral CI users were tested using the German Oldenburger Sentence Test (OLSA) under three spatial noise conditions (S0N0, S0N+90°, S0N-90°), with and without a 10-ms delay introduced to the right CI processor. Speech reception thresholds (SRTs) and SRM were analyzed using repeated-measures ANOVA.
RESULTS: No significant differences in SRT or SRM were found between the delay and non-delay conditions across all spatial configurations. A consistent right-ear advantage was observed, but the induced interaural delay did not significantly impair speech-in-noise performance.
CONCLUSION: A unilateral 10-ms delay in CI stimulation does not significantly affect speech perception or SRM in bilateral CI users. These findings indicate that a unilateral 10-ms interaural delay does not measurably affect speech perception or SRM in bilateral CI users. This observation is consistent with previous reports suggesting limited functional use of fine-grained interaural timing cues during speech-in-noise processing, although the present study cannot draw conclusions about smaller interaural delays.
METHODS: Eleven bilateral CI users were tested using the German Oldenburger Sentence Test (OLSA) under three spatial noise conditions (S0N0, S0N+90°, S0N-90°), with and without a 10-ms delay introduced to the right CI processor. Speech reception thresholds (SRTs) and SRM were analyzed using repeated-measures ANOVA.
RESULTS: No significant differences in SRT or SRM were found between the delay and non-delay conditions across all spatial configurations. A consistent right-ear advantage was observed, but the induced interaural delay did not significantly impair speech-in-noise performance.
CONCLUSION: A unilateral 10-ms delay in CI stimulation does not significantly affect speech perception or SRM in bilateral CI users. These findings indicate that a unilateral 10-ms interaural delay does not measurably affect speech perception or SRM in bilateral CI users. This observation is consistent with previous reports suggesting limited functional use of fine-grained interaural timing cues during speech-in-noise processing, although the present study cannot draw conclusions about smaller interaural delays.