scholarly journals Acoustic Change Complex (ACC) using Speech and Non-Speech Stimuli in Normal Hearing Children

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
W A Elkholy ◽  
D M Hassan ◽  
N A Shafik ◽  
Y E K Eltoukhy
Keyword(s):  
Auditory Evoked Potentials ◽  
Temporal Frequency ◽  
Normal Hearing ◽  
Auditory Discrimination ◽  
Auditory Evoked Potential ◽  
Frequency Change ◽  
Spectral Change ◽  
Speech Stimuli ◽  
Significant Difference ◽  
Hearing Children

Abstract Background Cortical auditory evoked potentials (CAEPs) are brain responses evoked by sound and are processed in or near the auditory cortex. ACC is a cortical auditory evoked potential (P1-N1-P2) elicited by a change within an ongoing sound stimulus. Objective To reach the best stimuli that can elicit ACC and act as an objective tool for assessment of cortical auditory discrimination in normal hearing children. Patients and Methods The present study was originally designed to standardize ACC evoked response in 41 children aged from 2 to 10 years. The mean age in our study group was 6.2 years with no significant difference between males and females. Stimuli used in this study were specifically designed to be used by AEP equipment that is capable of uploading short duration stimuli (500 msec.), thus can be used in a regular AEP lab. ACC was elicited by three groups of stimuli. Gap-in-tones stimuli represent temporal change (6, 10, 30 and 50 msec. gap introduced to 1000 Hz tone separately), frequency pairs stimuli represent frequency change (2%, 4%, 10% and 25% change from base freq. 1000 Hz) and vowel pairs stimuli represent spectral change (/i-u/, /u-i/, /i-a/. /a-i/, /u-a/, /a-u/). ACC response parameters were compared when using the different stimuli as regards percent detectability, morphology, latency and amplitude. Results Gap-in-tones at 6 msec. and 4% frequency change could elicit ACC response in 100% of subjects. For spectral change, /u-i/ was the highest in eliciting ACC (78%) followed by /i-u/ (68.2%) then /a-i/ (58.5%). ACC had the same morphology of the onset response in the majority of subjects, with longer latency and smaller amplitude. ACC amplitude is a better indicator of cortical discrimination compared to latency because it is consistently affected by magnitude of change. Conclusion ACC is a good electrophysiological tool for cortical auditory discrimination for temporal, frequency and spectral change.

Early Cochlear Implantation in Children Allows Normal Development of Central Auditory Pathways

2002 ◽  
Vol 111 (5_suppl) ◽  
pp. 38-41 ◽  
Author(s):  
Anu Sharma ◽  
Anthony Spahr ◽  
Michael Dorman ◽  
N. Wendell Todd
Keyword(s):  
Auditory System ◽  
Cochlear Implantation ◽  
Auditory Evoked Potentials ◽  
Normal Hearing ◽  
Auditory Evoked Potential ◽  
Deaf Children ◽  
Sensitive Period ◽  
Central Auditory System ◽  
Significant Difference ◽  
Central Auditory Pathways

The goal of this study was to determine whether there is a sensitive period during early development when a cochlear implantation can occur into a minimally degenerate and/or highly plastic central auditory system. Our measure of central auditory deprivation was latency of the P1 auditory evoked potential, whose generators include auditory thalamocortical areas. Auditory evoked potentials were recorded in 18 congenitally deaf children who were fitted with cochlear implants by 3.5 years of age. The P1 latencies of the children with implants were compared with the P1 latencies of their age-matched peers with normal hearing. There was no significant difference between the P1 latencies of the children with implants and the children with normal hearing. The present results suggest that early implantation occurs in a central auditory system that is minimally degenerate and/or highly plastic. Studies are ongoing to assess the consequences to the developing central auditory system of initiating electrical stimulation at later ages.

New possibility for measuring the cortical auditory evoked potentials: the HEARLab

2014 ◽  
Vol 155 (38) ◽  
pp. 1524-1529
Author(s):  
Ádám Bach ◽  
Ferenc Tóth ◽  
Vera Matievics ◽  
József Géza Kiss ◽  
József Jóri ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Evoked Potentials ◽  
Auditory System ◽  
Hearing Aids ◽  
Pure Tone ◽  
Auditory Evoked Potentials ◽  
Normal Hearing ◽  
Speech Stimuli ◽  
Novel Method ◽  
Cortical Auditory Evoked Potentials

Introduction: Cortical auditory evoked potentials can provide objective information about the highest level of the auditory system. Aim: The purpose of the authors was to introduce a new tool, the “HEARLab” which can be routinely used in clinical practice for the measurement of the cortical auditory evoked potentials. In addition, they wanted to establish standards of the analyzed parameters in subjects with normal hearing. Method: 25 adults with normal hearing were tested with speech stimuli, and frequency specific examinations were performed utilizing pure tone stimuli. Results: The findings regarding the latency and amplitude analyses of the evoked potentials confirm previously published results of this novel method. Conclusions: The HEARLAb can be a great help when performance of the conventional audiological examinations is complicated. The examination can be performed in uncooperative subjects even in the presence of hearing aids. The test is frequency specific and does not require anesthesia. Orv. Hetil., 2014, 155(38), 1524–1529.

Informational Masking Effects of Speech Versus Nonspeech Noise on Cortical Auditory Evoked Potentials

2021 ◽  
Vol 64 (10) ◽  
pp. 4014-4029
Author(s):  
Kathy R. Vander Werff ◽  
Christopher E. Niemczak ◽  
Kenneth Morse
Keyword(s):  
Auditory Processing ◽  
Auditory Evoked Potentials ◽  
Spectral Characteristics ◽  
Auditory Evoked Potential ◽  
Informational Masking ◽  
Neural Encoding ◽  
Speech Stimuli ◽  
Typical Morphology ◽  
Cortical Auditory Evoked Potentials ◽  
Speech Information

Purpose Background noise has been categorized as energetic masking due to spectrotemporal overlap of the target and masker on the auditory periphery or informational masking due to cognitive-level interference from relevant content such as speech. The effects of masking on cortical and sensory auditory processing can be objectively studied with the cortical auditory evoked potential (CAEP). However, whether effects on neural response morphology are due to energetic spectrotemporal differences or informational content is not fully understood. The current multi-experiment series was designed to assess the effects of speech versus nonspeech maskers on the neural encoding of speech information in the central auditory system, specifically in terms of the effects of speech babble noise maskers varying by talker number. Method CAEPs were recorded from normal-hearing young adults in response to speech syllables in the presence of energetic maskers (white or speech-shaped noise) and varying amounts of informational maskers (speech babble maskers). The primary manipulation of informational masking was the number of talkers in speech babble, and results on CAEPs were compared to those of nonspeech maskers with different temporal and spectral characteristics. Results Even when nonspeech noise maskers were spectrally shaped and temporally modulated to speech babble maskers, notable changes in the typical morphology of the CAEP in response to speech stimuli were identified in the presence of primarily energetic maskers and speech babble maskers with varying numbers of talkers. Conclusions While differences in CAEP outcomes did not reach significance by number of talkers, neural components were significantly affected by speech babble maskers compared to nonspeech maskers. These results suggest an informational masking influence on neural encoding of speech information at the sensory cortical level of auditory processing, even without active participation on the part of the listener.

scholarly journals Masking Level Difference and Electrophysiological Evaluation in Adults with Normal Hearing

2020 ◽  
Vol 24 (04) ◽  
pp. e399-e406
Author(s):  
Joyce Miranda Santiago ◽  
Cyntia Barbosa Laureano Luiz ◽  
Michele Garcia ◽  
Daniela Gil
Keyword(s):  
Auditory Processing ◽  
Auditory Evoked Potentials ◽  
Normal Hearing ◽  
Central Auditory Processing ◽  
Positive Correlation ◽  
Binaural Interaction ◽  
Level Difference ◽  
Significant Difference ◽  
Masking Level Difference ◽  
The Mean

Abstract Introduction The auditory structures of the brainstem are involved in binaural interaction, which contributes to sound location and auditory figure-background perception. Objective To investigate the performance of young adults in the masking level difference (MLD) test, brainstem auditory-evoked potentials (BAEPs) with click stimulus, and frequency-following response (FFR), as well as to verify the correlation between the findings, considering the topographic origin of the components of these procedures. Methods A total of 20 female subjects between 18 and 30 years of age, with normal hearing and no complaints concerning central auditory processing underwent a basic audiological evaluation, as well as the MLD test, BAEP and FFR. Results The mean result on the MLD test was of 10.70 dB. There was a statistically significant difference in the absolute latencies of waves I, III and V in the BAEPs of the ears. A change in the FFR characterized by the absence of the C, E and F waves was noticed. There was a statistically significant difference in the positive correlation of wave V in the BAEPs with the MLD. There was a statistically significant difference in the positive correlation of the mean MLD and the V, A and F components of the FFR. Conclusion The mean MLD was adequate. In the BAEPs, we observed that the click stimulus transmission occurred faster in the right ear. The FFR showed absence of some components. The mean MLD correlated positively with the BAEPs and FFR.

Speech Understanding Using Surgical Masks: A Problem in Health Care?

2008 ◽  
Vol 19 (09) ◽  
pp. 686-695 ◽  
Author(s):  
Lisa Lucks Mendel ◽  
Julie A. Gardino ◽  
Samuel R. Atcherson
Keyword(s):  
Health Care ◽  
Hearing Loss ◽  
Speech Perception ◽  
Hearing Impairment ◽  
Deleterious Effect ◽  
Normal Hearing ◽  
Speech Understanding ◽  
Speech Stimuli ◽  
Dental Office ◽  
Significant Difference

Background: Successful communication is necessary in health-care environments. Yet the presence of noise in hospitals, operating rooms, and dental offices may have a deleterious effect on health-care personnel and patients understanding messages accurately. The presence of a surgical mask and hearing loss may further affect speech perception. Purpose: To evaluate whether a surgical mask had an effect on speech understanding for listeners with normal hearing and hearing impairment when speech stimuli were administered in the presence or absence of dental office noise. Research Design: Participants were assigned to one of two groups based on hearing sensitivity in this quasi-experimental, cross-sectional study. Study Sample: A total of 31 adults participated in this study (1 talker, 15 listeners with normal hearing, and 15 with hearing impairment). The normal hearing group had thresholds of 25 dB HL or better at the octave frequencies from 250 through 8000 Hz while the hearing loss group had varying degrees and configurations of hearing loss with thresholds equal to or poorer than 25 dB HL for the same octave frequencies. Data Collection And Analysis: Selected lists from the Connected Speech Test (CST) were digitally recorded with and without a surgical mask present and then presented to the listeners in four conditions: without a mask in quiet, without a mask in noise, with a mask in quiet, and with a mask in noise. Results: A significant difference was found in the spectral analyses of the speech stimuli with and without the mask. The presence of a surgical mask, however, did not have a detrimental effect on speech understanding in either the normal-hearing or hearing-impaired groups. The dental office noise did have a significant effect on speech understanding for both groups. Conclusions: These findings suggest that the presence of a surgical mask did not negatively affect speech understanding. However, the presence of noise did have a deleterious effect on speech perception and warrants further attention in health-care environments.

Brainstem auditory evoked potential with increased stimulus rate in minor head trauma

1990 ◽  
Vol 104 (3) ◽  
pp. 191-194 ◽  
Author(s):  
Ludwig Podoshin ◽  
Yaacov Ben-David ◽  
Milo Fradis ◽  
Hillel Pratt ◽  
B. Sharf ◽  
...  
Keyword(s):  
Head Trauma ◽  
Auditory Evoked Potentials ◽  
Auditory Evoked Potential ◽  
Control Group ◽  
Conduction Time ◽  
Trauma Patients ◽  
Pathophysiological Mechanism ◽  
Minor Head Trauma ◽  
Stimulus Rate ◽  
Significant Difference

AbstractFifteen Minor Head Trauma patients were investigated by Brainstem Auditory Evoked Potentials at 10/s and 55/s stimulus rate. The results were compared with those of the same patients at a second examination, two months later, as well as with a matched normal control group. Increasing the stimulus rate in MHT patients caused a significant but reversible delay in the central conduction time. No significant difference was found regarding the interpeak latency differences at a 10/s stimulus rate. The present study suggests that the primary lesion in MHT is ischaemic, affecting synaptic efficiency, and not axonal damage. These findings may be informative on the as yet obscure pathophysiological mechanism of minor head trauma.

scholarly journals Mismatch Negativity Occurrence with Verbal and Nonverbal Stimuli in Normal-Hearing Adults

2020 ◽  
Vol 24 (02) ◽  
pp. e182-e190
Author(s):  
Mirtes Brückmann ◽  
Michele Vargas Garcia
Keyword(s):  
Reference Values ◽  
Mismatch Negativity ◽  
Evoked Potential ◽  
Normal Hearing ◽  
Verbal Stimulus ◽  
Auditory Evoked Potential ◽  
High Contrast ◽  
Auditory Event ◽  
Long Latency ◽  
Significant Difference

Abstract Introduction The mismatch negativity (MMN) is a long-latency auditory evoked potential related to a passive elicited auditory event. Objective To verify the occurrence of MMN with different stimuli, to describe reference values in normal-hearing adults with verbal and nonverbal stimuli and to compare them with each other, besides analyzing the latency, area, and amplitude regarding gender and between the ears. Method Normal-hearing individuals, aged between 18 and 59 years old, participated in the study. As inclusion criterion in the study, all of them underwent tone threshold audiometry, logoaudiometry, tympanometry, and the Dichotic Sentence Identification (DSI) test, and later the MMN with 4 different stimuli, being 2 verbal (da/ta and ba/di) and 2 nonverbal stimuli (750/1,000Hz and 750/4,000Hz), which are considered stimuli with low and high contrast. Results A total of 90 individuals composed the sample, being 39 males and 51 females, with an average age of 26.9 years old. In the analysis of the latency, amplitude, and area of the four stimuli between the ears, they were not considered statistically different. There was a significant difference between all of the stimuli in terms of latency, amplitude and area, with the highest latency found in da/ta, and the greatest amplitude and area in ba/di. Regarding gender, there was only difference in the latency of the da/ta stimulus. Conclusion The da/ta and 750/1,000Hz stimuli elicited the most MMN in the population of normal-hearing adults. Among the genders, there was difference only regarding the latency of the verbal stimulus da/ta, and there was no difference between the ears.

scholarly journals Cortical Auditory Evoked Potentials with Simple (Tone Burst) and Complex (Speech) Stimuli in Children with Cochlear Implant

2017 ◽  
Vol 21 (04) ◽  
pp. 351-357
Author(s):  
Kelly Vasconcelos Martins ◽  
Daniela Gil
Keyword(s):  
Cochlear Implant ◽  
Auditory Evoked Potentials ◽  
Evoked Potential ◽  
Tone Burst ◽  
Auditory Evoked Potential ◽  
Aural Rehabilitation ◽  
Auditory Rehabilitation ◽  
Complex Stimuli ◽  
Significant Difference ◽  
Cortical Auditory Evoked Potential

Introduction The registry of the component P1 of the cortical auditory evoked potential has been widely used to analyze the behavior of auditory pathways in response to cochlear implant stimulation. Objective To determine the influence of aural rehabilitation in the parameters of latency and amplitude of the P1 cortical auditory evoked potential component elicited by simple auditory stimuli (tone burst) and complex stimuli (speech) in children with cochlear implants. Method The study included six individuals of both genders aged 5 to 10 years old who have been cochlear implant users for at least 12 months, and who attended auditory rehabilitation with an aural rehabilitation therapy approach. Participants were submitted to research of the cortical auditory evoked potential at the beginning of the study and after 3 months of aural rehabilitation. To elicit the responses, simple stimuli (tone burst) and complex stimuli (speech) were used and presented in free field at 70 dB HL. The results were statistically analyzed, and both evaluations were compared. Results There was no significant difference between the type of eliciting stimulus of the cortical auditory evoked potential for the latency and the amplitude of P1. There was a statistically significant difference in the P1 latency between the evaluations for both stimuli, with reduction of the latency in the second evaluation after 3 months of auditory rehabilitation. There was no statistically significant difference regarding the amplitude of P1 under the two types of stimuli or in the two evaluations. Conclusion A decrease in latency of the P1 component elicited by both simple and complex stimuli was observed within a three-month interval in children with cochlear implant undergoing aural rehabilitation.

Development of Basic Auditory Discrimination in Preschool Children

1993 ◽  
Vol 4 (2) ◽  
pp. 104-107 ◽  
Author(s):  
Janet K. Jensen ◽  
Donna L. Neff
Keyword(s):  
Individual Differences ◽  
Preschool Children ◽  
Age Groups ◽  
Duration Discrimination ◽  
Normal Hearing ◽  
Auditory Discrimination ◽  
Large Individual ◽  
Intensity Discrimination ◽  
Hearing Children

Intensity (loudness), frequency (pitch), and duration discrimination were examined in 41 normal-hearing children, aged 4 to 6 years, and 9 adults. A second study retested 25 of the youngest children 12 to 18 months later. Intensity discrimination showed the least improvement with age and was adultlike by age 5 for most of the children. In contrast, frequency and duration discrimination showed highly significant improvement with age, hut remained poorer than adults' discrimination for many 6-year-olds. Large individual differences were observed within alt tasks and age groups.

scholarly journals O Impacto do Implante Coclear na Linguagem Oral das Crianças com Surdez Congénita

2015 ◽  
Vol 28 (4) ◽  
pp. 442 ◽  
Author(s):  
Daniela Ramos ◽  
João Xavier Jorge ◽  
António Teixeira ◽  
Carlos Ribeiro ◽  
António Paiva
Keyword(s):  
Cochlear Implant ◽  
Oral Language ◽  
Syntactic Structure ◽  
Sensorineural Deafness ◽  
Normal Hearing ◽  
School Level ◽  
Evaluation Instrument ◽  
Verbal Language ◽  
Significant Difference ◽  
Hearing Children

<strong>Introduction:</strong> Children with severe to profound sensorineural deafness can acquire vocabulary and syntactic structures to communicate by oral language, after cochlear implant.<br /><strong>Aim:</strong> Identify the linguistic skills of children with cochlear implant.<br /><strong>Material and Methods:</strong> Eighteen children of both gender, between 9 and 10 years, with congenital bilateral deafness, using cochlear implant, were studied. The evaluation instrument used was Observation Chart of Language-School Level. The results were compared with standard of normal-hearing children with the same hearing age.<br /><strong>Results:</strong> The scores registered in the linguistics structures studied, comparing implanted children and standard, was: phonology, 29.44 ± 8.4 vs. 29.68 ± 5.90, p = 0.91; semantics, 18.55 ± 8.89 vs. 19.20 ± 4.85, p = 0.76; morpho-syntax 21.89 ± 12.85 vs. 26.35 ± 10.36, p = 0.159. Regarding the tests of semantics, there was no significant difference. Concerning the tests of morpho-syntactic structure, the<br />difference was significant in the derivation of words, 2.83 ± 2.81 vs. 4.65 ± 1.64, p = 0.014. In the phonology, a significant difference was found comparing implanted children and standard, in the discrimination of pseudo words, 6.6 ± 2.8 vs. 8.37 ± 2.32, p = 0.023. However, in syllabic segmentation, implanted children had a mean score 8.56 ± 1.6 significantly higher than standard, 5.9 ± 1.58, p &lt; 0.001.<br /><strong>Discussion:</strong> The similarity of the scores obtained by children with cochlear implants with the standard, in the language components studied confirms that cochlear implant promotes the development of oral verbal language in children with congenital deafness.<br /><strong>Conclusions:</strong> Implanted children had acquired language skills similar to normal-hearing children with the same hearing age.

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