{"title":"Using the Mismatch Negativity to Evaluate Hearing Aid Directional Enhancement Based on Multistream Architecture.","authors":"Christopher Slugocki, Francis Kuk, Petri Korhonen","doi":"10.1097/AUD.0000000000001619","DOIUrl":null,"url":null,"abstract":"<p><strong>Objectives: </strong>To evaluate whether hearing aid directivity based on multistream architecture (MSA) might enhance the mismatch negativity (MMN) evoked by phonemic contrasts in noise.</p><p><strong>Design: </strong>Single-blind within-subjects design. Fifteen older adults (mean age = 72.7 years, range = 40 to 88 years, 8 females) with a moderate-to-severe degree of sensorineural hearing loss participated. Participants first performed an adaptive two-alternative forced choice phonemic discrimination task to determine the speech level-that is, signal to noise ratio (SNR)-required to reliably discriminate between two monosyllabic stimuli (/ba/ and /da/) presented in the presence of ongoing fixed-level background noise. Participants were then presented with a phonemic oddball sequence alternating on each trial between two loudspeakers located in the front at 0° and -30° azimuth. This sequence presented the same monosyllabic stimuli in the same background noise at individualized SNRs determined by the phonemic discrimination task. The MMN was measured as participants passively listened to the oddball sequence in two hearing aid conditions: MSA-ON and MSA-OFF.</p><p><strong>Results: </strong>The magnitude of the MMN component was significantly enhanced when evoked in MSA-ON relative to MSA-OFF conditions. Unexpectedly, MMN magnitudes were also positively related to degrees of hearing loss. Neither MSA nor the participant's hearing loss was found to independently affect MMN latency. However, MMN latency was significantly affected by the interaction of hearing aid condition and individualized SNRs, where a negative relationship between individualized SNR and MMN latency was observed only in the MSA-OFF condition.</p><p><strong>Conclusions: </strong>Hearing aid directivity based on the MSA approach was found to improve preattentive detection of phonemic contrasts in a simulated multi-talker situation as indexed by larger MMN component magnitudes. The MMN may generally be useful for exploring the underlying nature of speech-in-noise benefits conferred by some hearing aid features.</p>","PeriodicalId":55172,"journal":{"name":"Ear and Hearing","volume":" ","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ear and Hearing","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1097/AUD.0000000000001619","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Objectives: To evaluate whether hearing aid directivity based on multistream architecture (MSA) might enhance the mismatch negativity (MMN) evoked by phonemic contrasts in noise.
Design: Single-blind within-subjects design. Fifteen older adults (mean age = 72.7 years, range = 40 to 88 years, 8 females) with a moderate-to-severe degree of sensorineural hearing loss participated. Participants first performed an adaptive two-alternative forced choice phonemic discrimination task to determine the speech level-that is, signal to noise ratio (SNR)-required to reliably discriminate between two monosyllabic stimuli (/ba/ and /da/) presented in the presence of ongoing fixed-level background noise. Participants were then presented with a phonemic oddball sequence alternating on each trial between two loudspeakers located in the front at 0° and -30° azimuth. This sequence presented the same monosyllabic stimuli in the same background noise at individualized SNRs determined by the phonemic discrimination task. The MMN was measured as participants passively listened to the oddball sequence in two hearing aid conditions: MSA-ON and MSA-OFF.
Results: The magnitude of the MMN component was significantly enhanced when evoked in MSA-ON relative to MSA-OFF conditions. Unexpectedly, MMN magnitudes were also positively related to degrees of hearing loss. Neither MSA nor the participant's hearing loss was found to independently affect MMN latency. However, MMN latency was significantly affected by the interaction of hearing aid condition and individualized SNRs, where a negative relationship between individualized SNR and MMN latency was observed only in the MSA-OFF condition.
Conclusions: Hearing aid directivity based on the MSA approach was found to improve preattentive detection of phonemic contrasts in a simulated multi-talker situation as indexed by larger MMN component magnitudes. The MMN may generally be useful for exploring the underlying nature of speech-in-noise benefits conferred by some hearing aid features.
期刊介绍：
From the basic science of hearing and balance disorders to auditory electrophysiology to amplification and the psychological factors of hearing loss, Ear and Hearing covers all aspects of auditory and vestibular disorders. This multidisciplinary journal consolidates the various factors that contribute to identification, remediation, and audiologic and vestibular rehabilitation. It is the one journal that serves the diverse interest of all members of this professional community -- otologists, audiologists, educators, and to those involved in the design, manufacture, and distribution of amplification systems. The original articles published in the journal focus on assessment, diagnosis, and management of auditory and vestibular disorders.
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