Auditory-evoked Potential Studies of Cortical Maturation in Normal Hearing and Implanted Children: Correlations with Changes in Structure and Speech Perception

2003 ◽  
Vol 123 (2) ◽  
pp. 249-252 ◽  
Author(s):  
Jos J. Eggermont ◽  
Curtis W. Ponton
Keyword(s):  
Speech Perception ◽  
Evoked Potential ◽  
Normal Hearing ◽  
Auditory Evoked Potential ◽  
Cortical Maturation

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 Normal hearing young adults with mild tinnitus: Reduced inhibition as measured through sensory gating

2018 ◽  
Vol 8 (2) ◽  
Author(s):  
Julia Campbell ◽  
Connor Bean ◽  
Alison LaBrec
Keyword(s):  
Young Adults ◽  
Evoked Potential ◽  
Sensory Gating ◽  
Normal Hearing ◽  
Auditory Evoked Potential ◽  
Tinnitus Severity ◽  
Hearing Thresholds ◽  
Central Inhibition ◽  
Low Amplitude ◽  
Cortical Auditory Evoked Potential

Decreased central inhibition, possibly related to hearing loss, may contribute to chronic tinnitus. However, many individuals with normal hearing thresholds report tinnitus, suggesting that the percept in this population may arise from sources other than peripheral deafferentation. One measure of inhibition is sensory gating. Sensory gating involves the suppression of non-novel input, and is measured through cortical auditory evoked potential (CAEP) responses to paired stimuli. In typical gating function, amplitude suppression is observed in the second CAEP response when compared to the first CAEP response, illustrating inhibitory activity. Using this measure, we investigated central inhibitory processes in normal hearing young adults with and without mild tinnitus to determine whether inhibition may be a contributing factor to the tinnitus percept. Results showed that gating function was impaired in the tinnitus group, with the CAEP Pa component significantly correlated with tinnitus severity. Further exploratory analyses were conducted to evaluate variability in gating function within the tinnitus group, and findings showed that high CAEP amplitude suppressors demonstrated gating performance comparable to adults without tinnitus, while low amplitude suppressors exhibited atypical gating function.

Recovery Function of the Late Auditory Evoked Potential in Cochlear Implant Users and Normal-Hearing Listeners

2009 ◽  
Vol 20 (07) ◽  
pp. 397-408 ◽  
Author(s):  
Fawen Zhang ◽  
Ravi N. Samy ◽  
Jill M. Anderson ◽  
Lisa Houston
Keyword(s):  
Cochlear Implant ◽  
Evoked Potentials ◽  
Auditory Evoked Potentials ◽  
Evoked Potential ◽  
Aging Effect ◽  
Normal Hearing ◽  
Temporal Coding ◽  
Auditory Evoked Potential ◽  
Recovery Function ◽  
Probe Response

Background: It has been theorized that neural recovery is related to temporal coding of speech sounds. The recovery function of cortically generated auditory evoked potentials has not been investigated in cochlear implant (CI) users. Purpose: This study characterized the recovery function of the late auditory evoked potential (LAEP) using a masker–probe paradigm in postlingually deafened adult CI users and young normal-hearing (NH) listeners. Research Design: A case-control study of the late auditory evoked potentials using electrophysiological technique was performed. The LAEP was evoked by 1 kHz tone bursts presented in pairs, with the first stimuli as the maskers and the second stimuli as the probes. The masker–probe intervals (MPIs) were varied at 0.7, 1, 2, 4, and 8 sec, with an interpair interval of 12 sec. Study Sample: Nine CI users and nine NH listeners participated in this study. Data Collection and Analysis: The normalized amplitude from the probe response relative to the masker response was plotted as a function of the MPI to form a recovery function. The latency shift for the probe response relative to the masker response was calculated. Results: The recovery function was approximately linear in log scale of the MPI in NH listeners, while it showed somewhat different recovery patterns with a large intersubject variability in CI users. Specifically, although the probe response was approximately 60 percent of the masker response for the MPI of 0.7 sec in both groups, the recovery function of CI users displayed a nonlinear pattern, with a steeper slope than that of NH listeners. The probe response completely recovered at the MPI of 4 sec in NH listeners and at the MPI of 2 sec in CI users. N1 and P2 latencies from probe responses were shorter than those from masker responses in NH listeners, while no latency difference was found between probe responses and masker responses in CI users. Conclusions: Our interpretation of these findings is that the faster recovery of the LAEP in CI users is related to abnormal adaptation mechanisms and a less prominent role of the components with longer latencies in the LAEP of CI users. Other mechanisms such as the compromised inhibitory regulation in the auditory system and the aging effect in CI users might also play a role. More research needs to be done to determine whether the slope of the LAEP recovery function is correlated with speech-perception performance.

scholarly journals P300- long-latency auditory evoked potential in normal hearing subjects: simultaneous recording value in Fz and Cz

2009 ◽  
Vol 75 (2) ◽  
pp. 231-236 ◽  
Author(s):  
Josilene Luciene Duarte ◽  
Kátia de Freitas Alvarenga ◽  
Marcos Roberto Banhara ◽  
Ana Dolores Passarelli de Melo ◽  
Roberta Moreno Sás ◽  
...  
Keyword(s):  
Evoked Potential ◽  
Normal Hearing ◽  
Simultaneous Recording ◽  
Auditory Evoked Potential ◽  
Long Latency

Adaptation of the Connected Speech Test: Rerecording and Passage Equivalency

2020 ◽  
Vol 29 (2) ◽  
pp. 259-264 ◽  
Author(s):  
Hasan K. Saleh ◽  
Paula Folkeard ◽  
Ewan Macpherson ◽  
Susan Scollie
Keyword(s):  
Speech Perception ◽  
North American ◽  
First Language ◽  
Intraclass Correlation ◽  
Normal Hearing ◽  
Connected Speech ◽  
Internal Reliability ◽  
Speech Test ◽  
The Mean ◽  
Unit Standard

Purpose The original Connected Speech Test (CST; Cox et al., 1987) is a well-regarded and often utilized speech perception test. The aim of this study was to develop a new version of the CST using a neutral North American accent and to assess the use of this updated CST on participants with normal hearing. Method A female English speaker was recruited to read the original CST passages, which were recorded as the new CST stimuli. A study was designed to assess the newly recorded CST passages' equivalence and conduct normalization. The study included 19 Western University students (11 females and eight males) with normal hearing and with English as a first language. Results Raw scores for the 48 tested passages were converted to rationalized arcsine units, and average passage scores more than 1 rationalized arcsine unit standard deviation from the mean were excluded. The internal reliability of the 32 remaining passages was assessed, and the two-way random effects intraclass correlation was .944. Conclusion The aim of our study was to create new CST stimuli with a more general North American accent in order to minimize accent effects on the speech perception scores. The study resulted in 32 passages of equivalent difficulty for listeners with normal hearing.

An Eye-Tracking Study on Audiovisual Speech Perception Strategies Adopted by Normal-Hearing and Deaf Adults Under Different Language Familiarities

2020 ◽  
Vol 63 (7) ◽  
pp. 2245-2254 ◽  
Author(s):  
Jianrong Wang ◽  
Yumeng Zhu ◽  
Yu Chen ◽  
Abdilbar Mamat ◽  
Mei Yu ◽  
...  
Keyword(s):  
Speech Perception ◽  
Eye Tracking ◽  
Normal Hearing ◽  
Audiovisual Speech ◽  
Audiovisual Speech Perception ◽  
Allocation Pattern ◽  
Deaf Adults ◽  
Bilingual Speaker ◽  
Primary Hypothesis ◽  
Standard Chinese

Purpose The primary purpose of this study was to explore the audiovisual speech perception strategies.80.23.47 adopted by normal-hearing and deaf people in processing familiar and unfamiliar languages. Our primary hypothesis was that they would adopt different perception strategies due to different sensory experiences at an early age, limitations of the physical device, and the developmental gap of language, and others. Method Thirty normal-hearing adults and 33 prelingually deaf adults participated in the study. They were asked to perform judgment and listening tasks while watching videos of a Uygur–Mandarin bilingual speaker in a familiar language (Standard Chinese) or an unfamiliar language (Modern Uygur) while their eye movements were recorded by eye-tracking technology. Results Task had a slight influence on the distribution of selective attention, whereas subject and language had significant influences. To be specific, the normal-hearing and the d10eaf participants mainly gazed at the speaker's eyes and mouth, respectively, in the experiment; moreover, while the normal-hearing participants had to stare longer at the speaker's mouth when they confronted with the unfamiliar language Modern Uygur, the deaf participant did not change their attention allocation pattern when perceiving the two languages. Conclusions Normal-hearing and deaf adults adopt different audiovisual speech perception strategies: Normal-hearing adults mainly look at the eyes, and deaf adults mainly look at the mouth. Additionally, language and task can also modulate the speech perception strategy.

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