scholarly journals Complex auditory brainstem response in normal-hearing adults using binaural versus monaural speech stimuli

2017 ◽  
Vol 33 (4) ◽  
pp. 656
Author(s):  
RababAhmed Koura ◽  
AbeirOsman Dabbous ◽  
MonaMohamed Hamdy
Keyword(s):  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Normal Hearing ◽  
Speech Stimuli ◽  
Brainstem Response

scholarly journals Auditory brainstem response asymmetries in older adults: An exploratory study using click and speech stimuli

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251287
Author(s):  
Alejandro Ianiszewski ◽  
Adrian Fuente ◽  
Jean-Pierre Gagné
Keyword(s):  
Older Adults ◽  
Young Adults ◽  
Auditory Processing ◽  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Normal Hearing ◽  
Spectral Amplitude ◽  
Speech Stimuli ◽  
Brainstem Response ◽  
The Right

Background Some evidence suggests that young adults exhibit a selective laterality of auditory brainstem response (ABR) elicited with speech stimuli. Little is known about such an auditory laterality in older adults. Objective The aim of this study was to investigate possible asymmetric auditory brainstem processing between right and left ear presentation in older adults. Methods Sixty-two older adults presenting with normal hearing thresholds according to their age and who were native speakers of Quebec French participated in this study. ABR was recorded using click and a 40-ms /da/ syllable. ABR was elicited through monaural right and monaural left stimulation. Latency and amplitude for click-and speech-ABR components were compared between right and left ear presentations. In addition, for the /da/ syllable, a fast Fourier transform analysis of the sustained frequency-following response (FFR) of the vowel was performed along with stimulus-to-response and right-left ear correlation analyses. Results No significant differences between right and left ear presentation were found for amplitudes and latencies of the click-ABR components. Significantly shorter latencies for right ear presentation as compared to left ear presentation were observed for onset and offset transient components (V, A and O), sustained components (D and E), and voiced transition components (C) of the speech-ABR. In addition, the spectral amplitude of the fundamental frequency (F0) was significantly larger for the left ear presentation than the right ear presentation. Conclusions Results of this study show that older adults with normal hearing exhibit symmetric encoding for click stimuli at the brainstem level between the right and left ear presentation. However, they present with brainstem asymmetries for the encoding of selective stimulus components of the speech-ABR between the right and left ear presentation. The right ear presentation of a /da/ syllable elicited reduced neural timing for both transient and sustained components compared to the left ear. Conversely, a stronger left ear F0 encoding was observed. These findings suggest that at a preattentive, sensory stage of auditory processing, older adults lateralize speech stimuli similarly to young adults.

Use of Contralateral Masking in the Measurement of the Auditory Brainstem Response

1982 ◽  
Vol 25 (4) ◽  
pp. 528-535 ◽  
Author(s):  
Larry E. Humes ◽  
Marleen G. Ochs
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Auditory Brainstem Response ◽  
Mean Amplitude ◽  
Auditory Brainstem ◽  
Normal Hearing ◽  
Brainstem Response ◽  
The Mean ◽  
Intensity Functions ◽  
Contralateral Masking

In the first portion this study, the effects of two levels of contralateral masking on the auditory brainstem response (ABR) were investigated in 10 normal-hearing subjects. No significant changes were observed in the mean latency-intensity functions or the mean amplitude-intensity functions of this group of subjects when noise of various levels was added to the nontest ear. In the second portion of this study, ABRs were also recorded from the poorer ear of four subjects with a profound unilateral sensorineural hearing loss. Results from the latter group revealed a crossed-over wave V in all cases when the stimulus was delivered to the poorer ear and the nontest (better) ear was not masked. Contralateral masking obliterated this "crossed ABB" in all four unilaterally impaired subjects. These results provide support for the use of contralateral masking when recording from the poorer ear of subjects having asymmetrical hearing loss.

scholarly journals Detecting Noise-Induced Cochlear Synaptopathy by Auditory Brainstem Response in Tinnitus Patients With Normal Hearing Thresholds: A Meta-Analysis

2021 ◽  
Vol 15 ◽  
Author(s):  
Feifan Chen ◽  
Fei Zhao ◽  
Nadeem Mahafza ◽  
Wei Lu
Keyword(s):  
Auditory System ◽  
Auditory Brainstem Response ◽  
Noise Exposure ◽  
Meta Analysis ◽  
Auditory Brainstem ◽  
Normal Hearing ◽  
Central Auditory System ◽  
Gain Enhancement ◽  
Hearing Thresholds ◽  
Brainstem Response

Noise-induced cochlear synaptopathy (CS) is defined as a permanent loss of synapses in the auditory nerve pathway following noise exposure. Several studies using auditory brainstem response (ABR) have indicated the presence of CS and increased central gain in tinnitus patients with normal hearing thresholds (TNHT), but the results were inconsistent. This meta-analysis aimed to review the evidence of CS and its pathological changes in the central auditory system in TNHT. Published studies using ABR to study TNHT were reviewed. PubMed, EMBASE, and Scopus databases were selected to search for relevant literature. Studies (489) were retrieved, and 11 were included for meta-analysis. The results supported significantly reduced wave I amplitude in TNHT, whereas the alternations in wave V amplitude were inconsistent among the studies. Consistently increased V/I ratio indicated noise-induced central gain enhancement. The results indicated the evidence of noise-induced cochlear synaptopathy in tinnitus patients with normal hearing. However, inconsistent changes in wave V amplitude may be explained by that the failure of central gain that triggers the pathological neural changes in the central auditory system and/or that increased central gain may be necessary to generate tinnitus but not to maintain tinnitus.

scholarly journals Dipole tracing method analysis for source of auditory brainstem response (wave V) in two normal hearing subjects.

1991 ◽  
Vol 94 (12) ◽  
pp. 1880-1887
Author(s):  
YASUTOMO YOSHIDA ◽  
GINICHIROU ICHIKAWA ◽  
ATUSHI SAKURAI ◽  
MASAFUMI NAKAGAWA ◽  
SEIKI UOZAKI ◽  
...  
Keyword(s):  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Normal Hearing ◽  
Brainstem Response ◽  
Method Analysis ◽  
Dipole Tracing ◽  
Tracing Method
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