scholarly journals Effects of restricting maximum possible intensity on auditory steady-state responses

2019 ◽  
Author(s):  
Majid Haddadi Aval ◽  
Sadegh Jafarzadeh
Keyword(s):  
Steady State ◽  
Mean Value ◽  
Profound Hearing Loss ◽  
Auditory Thresholds ◽  
Hearing Sensitivity ◽  
Additional Information ◽  
State Response ◽  
Auditory Steady State Response ◽  
Steady State Responses ◽  
Auditory Steady State Responses

Background and Aim: Auditory steady-state response (ASSR) has widespread usage in the clinical hearing assessment of infants and young children. The present study evaluated the effect of restricting maximum possible intensity to 100 dB HL on ASSR thresholds. Methods: This retrospective study was conduc­ted in multiple audiology centers. ASSR thre­sholds with restricted settings were evaluated in 58 infants (116 ears). They had absent otoaco­ustic emissions and click-evoked auditory bra­instem response waveforms and bilateral severe to profound hearing loss in behavioral evalu­ations. Results: ASSR thresholds were absent in 28%, 25%, 60%, and 70% of ears in 500, 1000, 2000, and 4000 Hz, respectively. The mean value of remained thresholds was approximately 90−95 dB HL. Conclusion: Restricted ASSR settings are pre­valent; however, they fail to provide extensive additional information about hearing sensitivity. Thus, manufacturers are suggested to improve ASSR setting and transducers and resolve the intensity restrictions. ASSR settings should be able to test auditory thresholds to level of 120 dB HL.

scholarly journals Gamma-Range Auditory Steady-State Responses and Cognitive Performance: A Systematic Review

2021 ◽  
Vol 11 (2) ◽  
pp. 217
Author(s):  
Vykinta Parciauskaite ◽  
Jovana Bjekic ◽  
Inga Griskova-Bulanova
Keyword(s):  
Steady State ◽  
Developmental Disorders ◽  
Short Term Memory ◽  
Oscillatory Activity ◽  
State Response ◽  
Gamma Range ◽  
Auditory Steady State Response ◽  
Wide Range ◽  
Steady State Responses ◽  
Auditory Steady State Responses

The auditory steady-state response (ASSR) is a result of entrainment of the brain’s oscillatory activity to the frequency and phase of temporally modulated stimuli. Gamma-range ASSRs are utilized to observe the dysfunctions of brain-synchronization abilities in neuropsychiatric and developmental disorders with cognitive symptoms. However, the link between gamma-range ASSRs and cognitive functioning is not clear. We systematically reviewed existing findings on the associations between gamma-range ASSRs and cognitive functions in patients with neuropsychiatric or developmental disorders and healthy subjects. The literature search yielded 1597 articles. After excluding duplicates and assessing eligibility, 22 articles were included. In healthy participants, the gamma-range ASSR was related to cognitive flexibility and reasoning as measured by complex tasks and behavioral indicators of processing speed. In patients with schizophrenia, the studies that reported correlations found a higher ASSR to be accompanied by better performance on short-term memory tasks, long-term/semantic memory, and simple speeded tasks. The main findings indicate that individual differences in the gamma-range ASSR reflect the level of attentional control and the ability to temporary store and manipulate the information, which are necessary for a wide range of complex cognitive activities, including language, in both healthy and impaired populations.

scholarly journals Σύγκριση των click Auditory Brainstem Responses (ABR) και των chirp Auditory Steady-State Responses (ASSR), ηλεκτροφυσιολογικών (αντικειμενικών) μεθόδων που χρησιμοποιούνται για τον έλεγχο και τη διάγνωση της παιδικής βαρηκοΐας

2021 ◽  
Author(s):  
Κωνσταντίνος Μουρτζούχος
Keyword(s):  
Steady State ◽  
Tone Burst ◽  
Auditory Brainstem ◽  
Auditory Brainstem Responses ◽  
State Response ◽  
Auditory Steady State Response ◽  
Brainstem Response ◽  
Steady State Responses ◽  
Auditory Steady State Responses ◽  
State Responses

Τα προκλητά δυναμικά κατέχουν σημαντική θέση στον προσδιορισμό των ουδών της ακοής σε παιδιά πολύ μικρά για να εξεταστούν με τις συμβατικές συμπεριφορικές μεθόδους και σε άλλους πληθυσμούς που παρουσιάζουν δυσκολίες κατά την εξέταση. Το ABR (Auditory Brainstem Response), μέθοδος που χρησιμοποιείται κατά τα τελευταία 50 χρόνια, έχει σήμερα ευρέως αναγνωριστεί ως η πιο αποτελεσματική τεχνική προκλητών δυναμικών και χρησιμοποιείται καθημερινά, με click και tone burst ως ερεθίσματα, για την εκτίμηση της ακουστικής ικανότητας σε βρέφη και παιδιά πολύ μικρά για άλλες εξεταστικές μεθόδους. Η καταγραφή του ABR, ωστόσο, υπόκειται σε περιορισμούς ως προς το ανώτερο επίπεδο έντασης χορήγησης του ερεθίσματος, όπως επίσης και εξαιτίας της υποκειμενικής μεθόδου ελέγχου για τον προσδιορισμό του ουδού, ενώ οι καταγραφές με tone burst ερεθίσματα είναι συχνά πιο απαιτητικές ως προς την ερμηνεία τους, λόγω του ότι οι κυματομορφές μπορεί να είναι λιγότερο χαρακτηριστικές. Το ASSR (Auditory Steady-State Response) αποτελεί μια πιο πρόσφατη εναλλακτική πρόταση έναντι των καθιερωμένων ABR τεχνικών καταγραφής. Σε αντίθεση με το παροδικού τύπου ερέθισμα click που χρησιμοποιείται στις ABR καταγραφές, το διαμορφωμένο συνεχούς τύπου ερέθισμα του ASSR εκλύει μια περιοδική ή “steady-state” κυματομορφή, της οποίας τα φασματικά χαρακτηριστικά (εύρος και φάση) αναλύονται στο frequency ή και στο time domain για τον προσδιορισμό της παρουσίας ή της απουσίας απάντησης. Το αυτόματο σύστημα ανίχνευσης της απάντησης που χρησιμοποιείται στην καταγραφή του ASSR εξαλείφει την ανάγκη για υποκειμενικό τρόπο ελέγχου των απαντήσεων. Ο τύπος του ASSR ερεθίσματος που χρησιμοποιήθηκε σε αυτήν την μελέτη ήταν το narrowband CE-chirp, ένα είδος chirp που εισήλθε σχετικά πολύ πρόσφατα στις συσκευές που διατίθενται στο εμπόριο. Σκοπός αυτής της μελέτης ήταν να συγκρίνει αυτές τις δύο ηλεκτροφυσιολογικές μεθόδους και τον βαθμό στον οποίο συσχετίζονται, σε ένα μεγάλο πληθυσμό παιδιών με διάφορου βαθμού νευροαισθητήρια βαρηκοΐα, που εξετάστηκαν με φαρμακευτικό ύπνο στο Ακοολογικό Κέντρο της Κλινικής μας κατά το διάστημα 2010-14. Εξετάστηκαν συνολικά 130 παιδιά, 90 άρρενα και 40 θήλεα (n = 260 αυτιά), ηλικίας 5 έως 79 μηνών (μέση ηλικία: 32.7 ± 14.0 μήνες), με μια ποικιλία προβλημάτων και διαταραχών. Η τελική στατιστική ανάλυση για σύγκριση των δύο μεθόδων περιέλαβε αφ’ ενός τις τιμές ουδών που αποκτήθηκαν από το click ABR και αφ’ ετέρου τους μέσους όρους των ουδών που αποκτήθηκαν από το chirp ASSR στις συχνότητες 1, 2 και 4 kHz και 2 και 4 kHz. Τα αποτελέσματα αυτής της μελέτης ανέδειξαν ισχυρές συσχετίσεις μεταξύ των click ABR ουδών και των μέσων όρων των chirp ASSR ουδών στα 1000, 2000 και 4000 Hz (rs = .826, p < .001) και στα 2000 και 4000 Hz (rs = .824, p < .001) και συμφωνούν γενικά με τα αποτελέσματα παρόμοιων μελετών της διεθνούς βιβλιογραφίας. Συμπερασματικά φαίνεται ότι το ASSR είναι αναγκαίο για την ακριβή ποσοτικοποίηση της υπολειπόμενης ακοής στην ζώνη της μεγάλου προς πολύ μεγάλου βαθμού βαρηκοΐας, σε περιοχές εντάσεων άνω των ορίων των περισσοτέρων ABR συσκευών. Η «ακοολογική πληροφορία» που αποκτάται με το ASSR τεστ, ειδικά στην ανωτέρω περιοχή, είναι πολύτιμη στην λήψη αποφάσεων για περαιτέρω παρέμβαση σε παιδιά με νευροαισθητήρια βαρηκοΐα (ενίσχυση, κοχλιακή εμφύτευση), ιδίως για τα παιδιά εκείνα που δεν μπορούν να μετρηθούν με συμπεριφορικές μεθόδους. Τα αποτελέσματα αυτά ενισχύουν την χρήση του ASSR ως εναλλακτικού τεστ σε σχέση με το ABR στην εκτίμηση και αντιμετώπιση της παιδικής βαρηκοΐας.

The Auditory Steady State Response in Individuals with Neurological Insult of the Central Auditory Nervous System

2007 ◽  
Vol 18 (10) ◽  
pp. 826-845 ◽  
Author(s):  
Jennifer B. Shinn ◽  
Frank E. Musiek
Keyword(s):  
Hearing Loss ◽  
Steady State ◽  
Neurological Impairment ◽  
Control Group ◽  
Steady State Response ◽  
Hearing Sensitivity ◽  
State Response ◽  
Behavioral Thresholds ◽  
Auditory Steady State Response ◽  
Neurological Insult

The auditory steady state response (ASSR) has recently gained attention with respect to estimates of hearing sensitivity and configuration of hearing loss. The present investigation compared behavioral thresholds to estimated ASSR thresholds in subjects with confirmed CANS lesions to determine if this population can be accurately evaluated with ASSR techniques. Comparisons were made between the experimental group and a normal control group matched for age and hearing sensitivity. ASSR thresholds were obtained for the carrier frequencies of 500 and 2000 Hz with a 46 Hz modulation rate and compared to behavioral thresholds. Within and between group comparisons were made. The control group demonstrated strong correlation between their behavioral and estimated ASSR thresholds which significantly contrasted the neurological group. Additionally, individuals with neurological impairment of the CANS exhibited elevated thresholds that were on average 24 dB greater at 2000 Hz than their behavioral thresholds. These results suggest that individuals with neurological insult may appear as hearing impaired or having greater hearing loss than is actually present. As a result, the ASSR may demonstrate the potential to assist in the detection of CANS dysfunction. Las respuestas auditivas de estado estable (ASSR) han ganado atención recientemente con respecto a la estimación de la sensibilidad auditiva y la configuración de la pérdida auditiva. La presente investigación comparó los umbrales conductuales con umbrales estimados por ASSR en sujetos con lesiones CANS confirmadas para determinar si esta población podía ser evaluada con exactitud por medio de técnicas de ASSR. Las comparaciones se realizaron entre el grupo experimental y un grupo control normal ordenados por edad y sensibilidad auditiva. Los umbrales de los ASSR se obtuvieron por medio de frecuencias portadoras de 500 y 2000 Hz, con una tasa de modulación de 46 Hz y se compararon con los umbrales conductuales. Se realizaron comparaciones entre los grupos y dentro de un mismo grupo. El grupo de control mostró una fuerte correlación entre sus umbrales conductuales y los estimados por ASSR, que contrastó significativamente con el grupo neurológico. Adicionalmente, los individuos con un trastorno neurológico de CANS exhibieron umbrales elevados que fueron en promedio 24 dB más alto en 2000 Hz que sus umbrales conductuales. Estos resultados sugieren que los individuos con alteraciones neurológicas pueden lucir como alterados auditivamente o teniendo una pérdida auditiva mayor de la realidad. Como resultados, los ASSR puede demostrar el potencial para ayudar en la detección de la disfunción por CANS.

Normal Multiple Auditory Steady-State Response Thresholds to Air-Conducted Stimuli in Infants

2009 ◽  
Vol 20 (03) ◽  
pp. 196-207 ◽  
Author(s):  
Anna Van Maanen ◽  
David R. Stapells
Keyword(s):  
Steady State ◽  
Age Groups ◽  
Normal Hearing ◽  
Auditory Brain Stem Response ◽  
Auditory Brain Stem ◽  
Auditory Steady State Response ◽  
Threshold Assessment ◽  
Multiple Stimulus ◽  
Steady State Responses ◽  
Auditory Steady State Responses

Background and Purpose: Multiple auditory steady-state responses (ASSRs) to stimuli modulated at ˜80 Hz are a promising technique for threshold estimation in infants, but additional data are required. Research Design: We obtained multiple ASSRs to air-conducted (AC) stimuli. Study Sample: There were 54 children in two age groups: >six months (N = 32) and ≤six months (N = 22). All infants had normal hearing by tone-evoked auditory brain stem response. Results: ASSR thresholds, estimated from 50 percent using cumulative percent present distributions, were 36, 30, 24, and 15 dB HL at 500, 1000, 2000, and 4000 Hz, respectively. Most (≥90%) of the infants showed present ASSRs at 49, 45, 36, and 32 dB HL at 500, 1000, 2000, and 4000 Hz, respectively, with no differences in the results of younger versus older infants. When responses were present for all stimuli for both ears, most infants showed all eight responses within five minutes. Compared to ipsilateral responses, ASSRs in the contralateral EEG (electroencephalogram) channel were smaller and often absent. Conclusions: Based upon these data and the literature, normal AC ASSR “screening” levels would be 50, 45, 40, and 40 dB HL at 500, 1000, 2000, and 4000 Hz, respectively. Using the multiple-stimulus ASSR, infants with normal hearing referred for diagnostic electrophysiological threshold assessment can now be quickly confirmed as having normal thresholds for four frequencies in both ears.

Adults with Auditory Neuropathy: Comparison of Auditory Steady-State Response and Pure-Tone Audiometry

2009 ◽  
Vol 20 (10) ◽  
pp. 621-628 ◽  
Author(s):  
Zahra Jafari ◽  
Saeed Malayeri ◽  
Hassan Ashayeri ◽  
Mahdi Azizabadi Farahani
Keyword(s):  
Steady State ◽  
Pure Tone ◽  
Pure Tone Audiometry ◽  
Auditory Neuropathy ◽  
High Rate ◽  
Steady State Response ◽  
Low Frequencies ◽  
Auditory Thresholds ◽  
State Response ◽  
Auditory Steady State Response

Background: The relation between the auditory steady-state response (ASSR) and behavioral audiometric thresholds requires further clarification in the case of adults with auditory neuropathy/auditory dys-synchrony (AN/AD). Purpose: The aim of this study was to compare pure-tone audiometric threshold (PTAT) and ASSR in adults with AN/AD. Study Sample: Sixteen adult participants (32 ears) with AN/AD, ranging in age from 14 to 34 years. Data Collection and Analysis: PTAT and ASSR with high-rate stimulus modulation were measured at four octave frequencies, 500, 1000, 2000, and 4000 Hz, in each ear. The behavioral auditory thresholds were compared with ASSR estimated thresholds at each frequency. Analyses included comparison of group means and coefficients of correlation. Results: The average pure-tone thresholds revealed a moderate hearing loss in the AN/AD patients with a focus on the low frequencies. Low-frequency loss audiograms were observed in almost two-thirds of the participants. The estimated auditory thresholds measured by ASSR at all frequencies were substantially higher than the PTAT measures. There were no significant correlations between the PTAT and ASSR measurements at the 1000, 2000, and 4000 Hz frequencies (p > .05); the correlation between the two measures at 500 Hz (p = .029, r = 0.39) was weak but significant. Conclusion: There was no significant correlation between the PTAT and ASSR results at the majority of the frequencies usually tested in adults with AN/AD. Although ASSR is not a suitable method to estimate auditory thresholds in this group of patients, perhaps it can be utilized as an adjunct technique for the differential diagnosis of this disorder.

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