Acta oto-laryngologica · 2021
Adults with unilateral congenital ear canal atresia - sound localization ability and recognition of speech in competing speech in unaided condition.
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Siegbahn Malin, Engmér Berglin Cecilia, Hultcrantz Malou, Asp Filip
Аннотация
BACKGROUND: Individuals with unilateral hearing loss show poor spatial hearing, but individual variability is high.
AIMS/OBJECTIVES: To investigate if the degree of hearing loss in unilateral ear canal atresia affects horizontal sound localization and speech recognition.
MATERIALS AND METHODS: Twelve subjects with unilateral ear canal atresia without childhood hearing intervention. Previously published data from eight normal-hearing subjects in normal binaural as well as experimentally induced unilateral hearing loss served as a reference. Horizontal sound localization and recognition of speech in spatially separate competing speech were assessed.
RESULTS: Linear regression analysis demonstrated a relationship between sound localization accuracy (SLA) and the air conduction pure tone average of the atretic ear (r = 0.85, p=.007). The large proportion of variability in SLA (72%) explained by the degree of hearing loss of the atretic ear indicates that binaural processing is possible. SLA was worse than for normal hearing individuals (p<.0001), and comparable to moderate simulated unilateral hearing loss (p=.13). Speech discrimination was significantly worse than normal (p<.0001) and not dependent on degree of hearing loss of the atretic ear.
CONCLUSIONS AND SIGNIFICANCE: Individuals with congenital unilateral ear canal atresia show impaired horizontal SLA and recognition of speech in competing speech.
AIMS/OBJECTIVES: To investigate if the degree of hearing loss in unilateral ear canal atresia affects horizontal sound localization and speech recognition.
MATERIALS AND METHODS: Twelve subjects with unilateral ear canal atresia without childhood hearing intervention. Previously published data from eight normal-hearing subjects in normal binaural as well as experimentally induced unilateral hearing loss served as a reference. Horizontal sound localization and recognition of speech in spatially separate competing speech were assessed.
RESULTS: Linear regression analysis demonstrated a relationship between sound localization accuracy (SLA) and the air conduction pure tone average of the atretic ear (r = 0.85, p=.007). The large proportion of variability in SLA (72%) explained by the degree of hearing loss of the atretic ear indicates that binaural processing is possible. SLA was worse than for normal hearing individuals (p<.0001), and comparable to moderate simulated unilateral hearing loss (p=.13). Speech discrimination was significantly worse than normal (p<.0001) and not dependent on degree of hearing loss of the atretic ear.
CONCLUSIONS AND SIGNIFICANCE: Individuals with congenital unilateral ear canal atresia show impaired horizontal SLA and recognition of speech in competing speech.