Sounds Perception Test Research Articles

Influence of Speech Rate on Auditory Recognition in Cochlear Implant Users

Introduction: This study aimed to verify the influence of speech stimulus presentation and speed on auditory recognition in cochlear implant (CI) users with poorer performance. Methods: The cross-sectional observational study applied auditory speech perception tests to fifteen adults, using three different ways of presenting the stimulus, in the absence of competitive noise: monitored live voice (MLV); recorded speech at typical speed (RSTS); recorded speech at slow speed (RSSS). The scores were assessed using the Percent Sentence Recognition Index (PSRI). The data were inferentially analysed using the Friedman and Wilcoxon tests with a 95% confidence interval and 5% significance level (p < 0.05). Results: The mean age was 41.1 years, the mean duration of CI use was 11.4 years, and the mean hearing threshold was 29.7 ± 5.9 dBHL. Test performance, as determined by the PSRI, was MLV = 42.4 ± 17.9%; RSTS = 20.3 ± 14.3%; RSSS = 40.6 ± 20.7%. There was a significant difference identified for RSTS compared to MLV and RSSS. Conclusion: The way the stimulus is presented and the speed at which it is presented enable greater auditory speech recognition in CI users, thus favouring comprehension when the tests are applied in the MLV and RSSS modalities.

Ab. No. 93 Prevalence of Learning Disability in School-Going Kids of Government School in District Patiala, Punjab

Introduction: The purpose of the study is to determine the prevalence of learning disability in school-going children from the IIIrd –Vth class of government schools by using the Learning Disability Diagnostic Inventory (LDDI). The study contributes to expanding the role of physiotherapy in multidisciplinary teams by fostering effective therapeutic approaches to promote balanced development of children with learning disability. Methods: A total of 80 students belonging to the class III-V between the 8-11 years of age group from different government schools were selected as participants in the present study. Methods: The study was conducted using convenience sampling method. A detailed questionnaire was used to document each student’s academic performance. The students were then subjected to a series of assessments, including visual auditory perception tests and an IQ based (Colored Progressive Matrices) CPM test followed by LDDI filled by the teacher of each student. The data was analysed through descriptive statistics and inferences. Results: The findings of the study were that out of total 80 students the prevalence of Learning Disability in Writing domain constitutes (10%), Reading (7.5%), Speaking (21.25%),Reasoning (6.25%),Listening (25%), Arithmetic disability (8.75%). Students of primary class IIIrd-Vth were at higher risk of learning disability in government schools. Conclusion: The study concluded that the learning disability is more prevalent in early aged students between age of 8-11. Institutional based educational strategies are required for appropriate modifications in education and teaching techniques. Implications: The present study helps in making early diagnosis of learning disability at school level and further widens the spectrum for planned effective therapeutic interventions to enhance the academic performance of students with learning disability and enhance the overall quality of life.

Use of a humanoid robot for auditory psychophysical testing.

Tasks in psychophysical tests can at times be repetitive and cause individuals to lose engagement during the test. To facilitate engagement, we propose the use of a humanoid NAO robot, named Sam, as an alternative interface for conducting psychophysical tests. Specifically, we aim to evaluate the performance of Sam as an auditory testing interface, given its potential limitations and technical differences, in comparison to the current laptop interface. We examine the results and durations of two voice perception tests, voice cue sensitivity and voice gender categorisation, obtained from both the conventionally used laptop interface and Sam. Both tests investigate the perception and use of two speaker-specific voice cues, fundamental frequency (F0) and vocal tract length (VTL), important for characterising voice gender. Responses are logged on the laptop using a connected mouse, and on Sam using the tactile sensors. Comparison of test results from both interfaces shows functional similarity between the interfaces and replicates findings from previous studies with similar tests. Comparison of test durations shows longer testing times with Sam, primarily due to longer processing times in comparison to the laptop, as well as other design limitations due to the implementation of the test on the robot. Despite the inherent constraints of the NAO robot, such as in sound quality, relatively long processing and testing times, and different methods of response logging, the NAO interface appears to facilitate collecting similar data to the current laptop interface, confirming its potential as an alternative psychophysical test interface for auditory perception tests.

Study on auditory perception of tense and lax vowels of English as a FL by learners with Spanish as L1

Different studies in the field of perception of second-language sounds (L2) suggest that English learners with Spanish as their mother tongue language (L1) are influenced by the sounds of their L1 to perceive the sounds in the L2. As a result, learners are not able to perceive speech sounds as they are in English, because they assimilate the sounds of the foreign language (FL) based on their L1 (Best &amp; Tyler, 2007; Gibson &amp; Gibson, 1955). The objective of this research is to explore the capacity of perception of tense and lax vowels of English (Standard British accent) in 8 high school students from two subsidised schools in Chillán and San Carlos, Chile. The age of the participants range from 15 to 18 years old. One auditory perception test was used: An Identification Test was applied to measure the capacity of the participants to perceive lax and tense vowels: /i:/, /ɪ/, /æ/ and /^/.

Unimodal versus bimodal auditory stimulation in inner ear malformations: Cognitive, language, and motor performance.

New perspectives on rehabilitation options for inner ear malformations have still been studied in the literature. This study investigated the cognitive, language, and motor skills of auditory brainstem implant (ABI) users in unimodal and bimodal groups. The motor competency of the participants was assessed with Bruininks-Oseretsky Motor Proficiency Test-2 Short Form (BOT2 SF). Language performance was evaluated by the test of Early Language Development-3 and Speech Intelligibility Rating. Word identification, sentence recognition tests, and Categories of Auditory Performance were used to assess auditory perception skills. To examine the cognitive performance, Cancellation Test and Gesell Copy Form were administered. All the tests were conducted in a quiet environment without any distractions. The participants were divided into two groups: (1) 17 children in the unimodal group and (2) 11 children in the bimodal (who used a cochlear implant on one side and ABI on the other side) group. There were significant correlations between the chronological age of participants and BOT2 SF total score, cancellation tests, auditory perception tests, and language performance. Similarly, there were significant correlations between the duration of ABI use and auditory perception tests, language performance, cancellation test, and some BOT2 SF subtests (r = -0.47 to -0.60, p < .001). There was no significant difference between the unimodal and bimodal groups in any task (p > .05). However, there were moderate-to-strong correlations among the auditory perception tests, cancellation test, language test, and BOT2 SF total score and subtests (r = 0.40 to 0.55, p < .05). Although there were no significant differences between bimodal and unimodal groups, a holistic approach, which indicates that hearing and balance issues can have broader impacts on a person's physical, emotional, social, and psychological aspects, should be used in the assessment process. Level 4.

Results of cochlear implant surgery in patients with auditory neuropathy.

The primary aim of this study was to analyze the benefit of cochlear implants for patients with auditory neuropathy. The secondary aim was to identify risk factors for auditory neuropathy. Patients with cochlear implants (CIs) who were educated in hearing rehabilitation schools were included in the study. A total of 175 children were operated on for cochlear implantation between August 2019 and August 2021 in the department of otorhinolaryngology at different centers in Turkey, and while 16 (9.1%) of those patients had auditory neuropathy spectrum disorder (ANSD), 159 (90.9%) had sensorineural hearing loss (SNHL). Differences in auditory perception between the two groups were examined. Auditory perception tests were applied for these patients 6 months after CI surgery. The auditory perception performances of the patients were evaluated with the Evaluation of Auditory Responses to Speech (EARS) battery, including the Littlears, Lip, Bıs4, Bıs12, Cap, Sır, Mtp-3, Mtp-6, Mtp-12, Matrix A1, and Gasp tests. All patients had profound bilateral SNHL. Four auditory perception tests (Littlears, Bıs-12, Sır, Matrix A1) showed similar results between patients with ANSD and SNHL, but seven auditory perception tests (Lıp, Bıs-4, Cap, Mtp-3, Mtp-6, Mtp-12, Gasp) showed significantly higher results among patients with SNHL. Hyperbilirubinemia, prematurity, consanguineous marriage, and family history of hearing loss were found to be common among patients with ANSD. ANSD patients who do not benefit from hearing aids benefit from CI surgery.

The impact of audio effects processing on the perception of hardness of Bass Drum

In the music mixing, mixers and music producers often use hardness to describe the feeling of percussion instruments, such as the drum instruments. When dealing with the hardness of drums, the mixer often mixes the sound in terms of frequency and dynamics. One important issue is that it is difficult to define the contribution of adjusting the frequency or dynamics of the drum to the perception of drum tone hardness, and this perception is difficult to be quantified. A subjective user study on the hardness of drum sound is proposed. Taking the audio of the Bass Drum as an example, different audio effects are applied to process the Bass Drum. Twenty-three participants were recruited to participate the auditory perception test. The result indicates that compression, equalisation, high-frequency excitation and low-frequency excitation all have varying degrees of impact on the hardness of the Bass Drum. The high-frequency excitation and low-frequency excitation have a statistically significant substantial influence on the sound hardness of the Bass Drum. Taking together, for the first time, the authors’ study comprehensively investigate the impact of audio effect processing on the perception of the hardness of Bass Drum, providing useful guidance for the application of various audio effects on percussion instruments.

The Development of a Paediatric Phoneme Discrimination Test for Arabic Phonemic Contrasts.

Objective: The aim of this project was to develop the Arabic CAPT (A-CAPT), a Standard Arabic version of the CHEAR auditory perception test (CAPT) that assesses consonant perception ability in children. Method: This closed-set test was evaluated with normal-hearing children aged 5 to 11 years. Development and validation of the speech materials were accomplished in two experimental phases. Twenty-six children participated in phase I, where the test materials were piloted to ensure that the selected words were age appropriate and that the form of Arabic used was familiar to the children. Sixteen children participated in phase II where test–retest reliability, age effects, and critical differences were measured. A computerized implementation was used to present stimuli and collect responses. Children selected one of four response options displayed on a screen for each trial. Results: Two lists of 32 words were developed with two levels of difficulty, easy and hard. Assessment of test–retest reliability for the final version of the lists showed a strong agreement. A within-subject ANOVA showed no significant difference between test and retest sessions. Performance improved with increasing age. Critical difference values were similar to the British English version of the CAPT. Conclusions: The A-CAPT is an appropriate speech perception test for assessing Arabic-speaking children as young as 5 years old. This test can reliably assess consonant perception ability and monitor changes over time or after an intervention.

Clinical characteristics and outcomes of children with cochlear implants who had preoperative residual hearing

Objective Cochlear implants (CI) candidacy criteria have expanded to include children with more residual hearing. This study explored the clinical profiles and outcomes of children with CIs who had preoperative residual hearing in at least one ear. Design A retrospective chart review was conducted to collect clinical characteristics and speech perception data. Pre- and post-CI auditory and speech perception data were analysed using a modified version of the Pediatric Ranked Order Speech Perception (PROSPER) score. Study sample This study included all children with residual hearing who received CIs in one Canadian paediatric centre from 1992 to 2018. Results A total of 100 of 389 (25.7%) children with CIs had residual hearing (median 77.6 dB HL, better ear). The proportion of children with residual hearing increased from 1992 to 2018. Children who had auditory behaviour and speech perception tests (n = 83) showed higher modified PROSPER scores post-CI compared to pre-CI. Phonologically Balanced Kindergarten (PBK) test scores were available for 71 children post-CI; 81.7% (58/71) of children achieved > 80% on the PBK. Conclusions One in four children who received CIs had residual hearing, and most of them had severe hearing loss at pre-CI. These children showed a high level of speech perception with CIs.

Preliminary Results of the Adaptation of Developmental Test of Auditory Perception (DTAP) to Turkish with Normal Hearing Children and Adolescents

Preliminary Results of the Adaptation of Developmental Test of Auditory Perception (DTAP) to Turkish with Normal Hearing Children and Adolescents

Central Auditory Tests to Track Cognitive Function in People With HIV: Longitudinal Cohort Study.

BackgroundThe development of neurocognitive deficits in people infected with HIV is a significant public health problem. Previous cross-sectional studies have shown that performance on central auditory tests (CATs) correlates with cognitive test results in those with HIV, but no longitudinal data exist for confirmation. We have been performing longitudinal assessments of central auditory and cognitive function on a cohort of HIV-positive and HIV-negative individuals in Dar es Salaam, Tanzania to understand how the central auditory system could be used to study and track the progress of central nervous system dysfunction.ObjectiveThe goal of the project was to determine if CATs can track the trajectory of cognitive function over time in people diagnosed with HIV.MethodsTests of peripheral and central auditory function as well as cognitive performance were performed on 382 individuals over the course of 3.5 years. Visits were scheduled every 6 months. CATs included tests of auditory temporal processing (gap detection) and speech perception in noise (Hearing in Noise Test and Triple Digit Test). Cognitive tests included the Montreal Cognitive Assessment (MoCA), Test of Variables of Attention (TOVA), and subtests from the Cogstate battery. HIV-positive subjects were divided into groups based on their CAT results at their final visit (bottom 20%, top 20%, middle 60%). Primary analyses focused on the comparison between HIV-positive individuals that performed worse on CATs (bottom 20%) and the overall HIV-positive group (middle 60%). Data were analyzed using linear mixed-effect models with time as the main fixed effect.ResultsThe group with the worst (bottom 20%) CAT performance showed a difference in trajectory for the MoCA (P=.003), TOVA (P<.048), and Cogstate (P<.046) over the course of the study period compared to the overall HIV-positive group. A battery of three CATs showed a significant difference in cognitive trajectory over a relatively short study period of 3.5 years independent of age (bottom 20% vs HIV-positive group).ConclusionsThe results of this study support the ability for CATs to track cognitive function over time, suggesting that central auditory processing can provide a window into central nervous system performance. CATs can be simple to perform, and are relatively insensitive to education and socioeconomic status because they only require repeating sentences, numbers, or detecting gaps in noise. These tests could potentially provide a time-efficient, low-cost method to screen for and monitor cognitive decline in patients with HIV, making them a useful surveillance tool for this major public health problem.

Children with Auditory Brainstem Implant: How Do They Perform in Motor and Language Skills?

Background: Young children are able to explore new objects and practice language through the acquisition of motor skills that lead to their overall development. Congenital hearing loss and total vestibular loss may contribute to the delay in speech and motor skill development. Objectives: To investigate the relationship between motor development performance, speech perception, and language performance in children with auditory brainstem implant (ABI). Method: Ten children, aged 4–17 years (mean age 9.76 ± 4.03), fitted with unilateral ABI for at least 2 years due to the presence of labyrinthine aplasia and rudimentary otocyst at least 1 side were included in the study. Several standardized tests, such as Bruininks-Oseretsky Motor Proficiency Test-2 (BOT-2), Children’s Auditory Perception Test Battery, Meaningful Auditory Integration Scale (MAIS), and Test of Early Language Development-3, were performed to evaluate their skills of fine motor control, balance, manual dexterity, language, and auditory perception. Results: A significant correlation was established between the BOT-2 manual dexterity and MAIS scores (r = 0.827, p < 0.05) and between the manual dexterity and language skills (for expressive language, r = 0.762, p < 0.05; for receptive language, r = 0.650, p < 0.05). Some of the BOT-2 balance tasks, such as standing on 1 leg on a line with eyes closed, standing on 1 leg on a balance beam with eyes open, standing heel-to-toe on a balance beam, and walking forward heel-to-toe on a line, showed a strong correlation with their receptive and expressive language performance (p < 0.05). Conclusion: The current study has indicated that significantly poor manual and balance performances are associated with poor speech perception and language skills in children with ABI. The authors recommend performing a vestibular assessment before and after ABI surgery and the use of a holistic rehabilitation approach, including auditory and vestibular rehabilitation, to support development of the children with ABI.

Articulación y percepción de /t/ en el habla de adultos mayores edéntulos y portadores de prótesis dentales totales

In this paper we present the main realizations of the /t/ phoneme in a speech corpus of Mexico City elderly adults with edentulism and wearing dental prostheses. Plosive, fricative and affricate realizations of the /t / phoneme with durations ranging from 23 milliseconds (ms) up to 271 ms, as well as second phase durations spanning 5 ms to 92 ms were observed. An analysis of the relevance of the acoustic features of this phoneme through a series of auditory perception tests revealed that, in most cases, /t/ was identified despite the modification or elision of the prototypical acoustic characteristics. It was particularly relevant that the decrease in the total duration of the stimulus did not affect the perception of /t/.

Audiological Performance in Children with Inner Ear Malformations Before and After Cochlear Implantation: A Cohort Study of 274 Patients.

Inner ear malformations (IEMs) are common in children with hearing loss. The different types of IEMs form a unique subgroup of cochlear implant (CI) candidates. We aimed to evaluate the auditory perception outcomes of CI in children with different types of IEMs and compare them with CI users without IEMs. The study included 274 CI users with and without IEMs as two groups (n=137, each). Both groups' chronological age at implantation and duration of CI usage was matched (± 8months). All subjects were evaluated pre-operatively and post-operatively by the Ling's sound test and the auditory perception test battery, which includes the Meaningful Auditory Integration Scale (MAIS), closed-set Pattern Perception Test (PPT) and open-set Sentence Recognition Test (SRT). Besides, children with IEMs were assessed for language development. Progress in the IEMs' group differed according to the type of ear anomaly. CI users with enlarged vestibular aqueduct had the highest scores, while users with common cavity had the lowest. Children with IEMs performed well on the closed-set test while having difficulty with the open-set test. Cochlear implantation outcomes are favourable in IEMs' patients with a cochlear nerve visible on magnetic resonance imaging. Our results indicate that it is critical to take the anatomical differences into account during follow-up and rehabilitation programmes. Each CI user should be evaluated according to his or her individual needs.

The Effect of Fatigue on Working Memory and Auditory Perceptual Abilities in Trained Musicians.

Purpose Many perceptual processing processes, such as cognition, vision, sensation, and audition, are affected due to fatigue. Musicians are prone to fatigue because of long working hours and demanding profession. The research on assessing working memory abilities in musicians is heterogeneous, as none of the studies has controlled the effect of fatigue. This study was thus designed to assess the effect of fatigue on working memory and auditory perception in trained instrumental musicians. Method Twenty-six trained instrumental musicians and 25 nonmusicians participated in this study. The effect of fatigue was assessed by administering the working memory and auditory perception tests in prefatigue and postfatigue conditions. The fatigue was assessed using a 100-point visual analog scale. The working memory was assessed using Operation Span, Reading Span, and Digit Span (Forward and Backward) tests (Knutson et al., 1991). Auditory perception was assessed using speech-perception-in-noise and temporal integration tests. Results Working memory and speech perception were affected due to fatigue. Musicians, despite having better working memory abilities than nonmusicians, are equally prone to fatigue-related distress. Conclusion The advantage of music training for the working memory abilities may be reduced due to fatigue; hence, measures to reduce fatigue should be employed by the musicians. Fatigue should also be treated as a variable in all future research related to assess cognitive processing in musicians.

Developmental and Academic Learning differences for Pre-School Children in North Jeddah, Saudi Arabia

The aim of the research was to determine the size of the problem of learning differentials for preschool children for the target group during the period from 20/4/1436 to 3/5/1436 AH, while applied to the sample studied during the period from 5/5/1436 to 13/5 / 1436 e. The researcher used the descriptive method of "survey study". The researcher applied some scientific tests and measurements to measure some learning differences on a sample of (100) children and their child (53 males and 47 females) in pre-school in Jeddah. The results of the study showed that the differences in visual memory were the most common learning differences (51%) and the auditory differences (25%), followed by learning differences (24%) and mathematical inference (24%) respectively. The results also showed significant differences between males and females in the tests of hyperactivity, dizziness, attention, social interaction, writing, and auditory perception for females, and males and females are equal in tests of social maturity, pre-reading, mathematical inference and visual memory. Among students born in 2010 and students born in 2011 in social maturity tests, social interactions, writing, auditory perception, visual memory, pre-reading for age 5, attention tests, impulse and hyperactivity. For (4) years, while there were no differences according to the variables (gender - age) in other measures. The researcher recommends taking into account the child's access to the level of maturity appropriate for learning to read and write and account, and not forced to do so in the pre-school, and interest in building programs of motor education for children and the need to apply to students outside the classroom. As well as the importance of focusing teachers on activities that are concerned with the development of the child's senses in general, and on audio-visual activities in particular, and assigning the task of pre-school teaching to qualified teachers in the field of child education.

Effects of radiological abnormalities in temporal bone and brain on auditory outcomes in cochlear implant recipient children

Introduction: Cochlear implantation (CI) is used for rehabilitation of children with bilateral severe-to-profound sensorineural hearing loss. Recently, treatment of such children has been influenced by diagnostic technological advances. Multiple radiological abnormalities detected in temporal bone and brain are now increasingly included for CI. The primary aim of this study was to determine the effects of “radiological abnormalities in temporal bone or brain” on CI outcome. Aim: The primary aim of this study was to determine the effects of “radiological abnormalities in high-resolution computed tomography (HRCT) temporal bone or magnetic resonance imaging (MRI) brain” on CI outcome. Study Design: Prospective study. Setting: Tertiary care center. Materials and Methods: In this study, we evaluated fifty cochlear-implanted children from October 2011 to March 2013. The case group consisted of 15 (30%) children with radiological abnormalities and control group consisted of 35 (70%) children with no radiological abnormalities in HRCT temporal bone or MRI brain. All patients received auditory and speech rehabilitation, and their auditory perception outcomes 1 year after CI were evaluated. The children were assessed by categories of auditory perception (CAP) and Meaningful Auditory Integration Scale (MAIS) tests. Results: There was significant reduction in mean auditory perception outcomes (decreased 6.9% mean CAP and 5.4% mean MAIS scores) at 1 year post-CI in CI recipients who had radiological abnormalities, in comparison to those who had no radiological abnormalities in temporal bone or brain (P

Dysmorphic features and cochlear implantation outcome in children with sensorineural hearing loss; the headmost study

Introduction: Recently, treatment of children with severe-to-profound sensorineural hearing loss (SNHL) has been influenced by diagnostic improvements and technological treatment advances, specifically new cochlear implant prospects. Multiple handicaps children and children with syndromes and conditions resulting disabilities, such as dual sensory loss, cerebral palsy, somatic abnormalities, and autistic spectrum disorder, are now not routinely precluded from receiving a cochlear implant. The primary aim of this study was to determine the effects of dysmorphic feature on cochlear implant outcome. Materials and Methods: In this cohort study, we evaluated 336 cochlear implanted children from 2007 to 2009. The case group consists of 53 patients (15/7%) with dysmorphic features and control group consisted at 53 patients with normal features and without behavioral and developmental disorders. All patients received auditory and speech rehabilitation and we evaluated their speech and auditory outcome. One year after cochlear implantation, the patient was assessed by categories of auditory perception (CAP) and speech intelligibility rating (SIR) tests. Results: We included 106 out of 336 cochlear implanted children, with the mean age of 30.42 ± 12.16 (maximum 48 months), 52 cases (49.1%) were girls and 54 (50.9%) were boys. There was a significant difference in SIR between case and control groups (3.26 ± 0.98) versus (4.06 ± 0.94) (P

Avaliação da percepção auditiva em mulheres durante ciclo menstrual: revisão sistemática

Introdução: As flutuações hormonais que ocorrem normalmente durante o ciclo menstrual podem interferir no sistema auditivo. A alteração mais encontrada neste período é a diminuição da acuidade auditiva, que parece estar mais associada à flutuação dos níveis de estrogênio, quando este se encontra reduzido na fase lútea final do período menstrual. Objetivo: Investigar por meio de uma revisão sistemática a percepção auditiva de mulheres durante as fases do ciclo menstrual. Método: Foi realizada uma busca nas bases de dados eletrônicas, nacionais e internacionais, LILACS, MEDLINE, PubMed e SciELO, através da consulta pelos seguintes descritores: “percepção auditiva” AND “ciclo menstrual”, “percepção de fala” AND “ciclo menstrual”, “percepção de fala” AND “hormônios” e seus correspondentes na língua inglesa. Resultados: Dos 293 artigos encontrados, foram selecionados apenas 7 artigos, após os critérios de inclusão e exclusão. A caracterização da amostra dos artigos selecionados variou entre 15 a 39 mulheres, com idade variando entre 17 e 46 anos. Na maioria dos artigos, nenhum tipo de procedimento clínico para estimar as fases do ciclo menstrual foi utilizado. Foi observada a realização de testes de percepção auditiva nos sete artigos selecionados, tendo destaque os testes dicóticos. Conclusão: Há necessidade da realização de mais pesquisas sobre o assunto, exigindo-se também maior rigor metodológico na elaboração desses estudos, através de procedimentos clínicos seguros e padronizados para mensuração dos níveis hormonais.

Brainstem Evoked Potential Indices of Subcortical Auditory Processing After Mild Traumatic Brain Injury.

The primary aim of this study was to assess subcortical auditory processing in individuals with chronic symptoms after mild traumatic brain injury (mTBI) by measuring auditory brainstem responses (ABRs) to standard click and complex speech stimuli. Consistent with reports in the literature of auditory problems after mTBI (despite normal-hearing thresholds), it was hypothesized that individuals with mTBI would have evidence of impaired neural encoding in the auditory brainstem compared to noninjured controls, as evidenced by delayed latencies and reduced amplitudes of ABR components. We further hypothesized that the speech-evoked ABR would be more sensitive than the click-evoked ABR to group differences because of its complex nature, particularly when recorded in a background noise condition. Click- and speech-ABRs were collected in 32 individuals diagnosed with mTBI in the past 3 to 18 months. All mTBI participants were experiencing ongoing injury symptoms for which they were seeking rehabilitation through a brain injury rehabilitation management program. The same data were collected in a group of 32 age- and gender-matched controls with no history of head injury. ABRs were recorded in both left and right ears for all participants in all conditions. Speech-ABRs were collected in both quiet and in a background of continuous 20-talker babble ipsilateral noise. Peak latencies and amplitudes were compared between groups and across subgroups of mTBI participants categorized by their behavioral auditory test performance. Click-ABR results were not significantly different between the mTBI and control groups. However, when comparing the control group to only those mTBI subjects with measurably decreased performance on auditory behavioral tests, small differences emerged, including delayed latencies for waves I, III, and V. Similarly, few significant group differences were observed for peak amplitudes and latencies of the speech-ABR when comparing at the whole group level but were again observed between controls and those mTBI subjects with abnormal behavioral auditory test performance. These differences were seen for the onset portions of the speech-ABR waveforms in quiet and were close to significant for the onset wave. Across groups, quiet versus noise comparisons were significant for most speech-ABR measures but the noise condition did not reveal more group differences than speech-ABR in quiet, likely because of variability and overall small amplitudes in this condition for both groups. The outcomes of this study indicate that subcortical neural encoding of auditory information is affected in a significant portion of individuals with long-term problems after mTBI. These subcortical differences appear to relate to performance on tests of auditory processing and perception, even in the absence of significant hearing loss on the audiogram. While confounds of age and slight differences in audiometric thresholds cannot be ruled out, these preliminary results are consistent with the idea that mTBI can result in neuronal changes within the subcortical auditory pathway that appear to relate to functional auditory outcomes. Although further research is needed, clinical audiological evaluation of individuals with ongoing post-mTBI symptoms is warranted for identification of individuals who may benefit from auditory rehabilitation as part of their overall treatment plan.