Search for normality criteria of auditory brain responses and auditory steady state response with free-field stimulation

2019 ◽  
Vol 70 (5) ◽  
pp. 258-264 ◽  
Author(s):  
Juan B. Calero del Castillo ◽  
Alberto J. Guillén Martínez ◽  
Francisco García-Purriños García
Keyword(s):  
Steady State ◽  
Free Field ◽  
Field Stimulation ◽  
Steady State Response ◽  
State Response ◽  
Brain Responses ◽  
Auditory Steady State Response

scholarly journals Registration of assr-thresholds in free field stimulation in normal hearing persons. Our experience

2020 ◽  
Vol 19 (5) ◽  
pp. 63-67
Author(s):  
I. V. Naumova ◽  
◽  
A. V. Pashkov ◽  
I. V. Zelenkova ◽  
D. S. Klyachko ◽  
...  
Keyword(s):  
Steady State ◽  
Objective Assessment ◽  
Free Field ◽  
Normal Hearing ◽  
Diagnostic Methods ◽  
Field Stimulation ◽  
Steady State Response ◽  
State Response ◽  
Behavioral Thresholds ◽  
Auditory Steady State Response

Background: Currently, for an objective assessment of the thresholds of auditory sensitivity, one of the most popular diagnostic methods is the method of recording of auditory steady state response - the ASSR test. One of the primary uses of ASSR is to assess sound thresholds correlated with tonal threshold audiometry. Actually, there are no reliable criteria for the norm for this study with free field stimulation, in conditions close to the natural listening environment. The identification of these criteria will allow this method to be applied as a routine in patients who cannot be tested in the usual way using headsets or in-ear phones (headphones). Objective: To determine the correlation of the ASSR thresholds with free field stimulation and the responses of insert-transducers stimulation and values of tonal threshold audiometry in the free field in normally hearing individuals. Design: Behavioral thresholds in a free field were compared with the results of ASSR in 20 normally hearing adults (40 ears) with stimulus delivery both via insert-transducers and using a loudspeaker. Conclusion: The ASSR thresholds in normal hearing adults obtained by free field were comparable to the thresholds obtained with a stimulus through insert- transducers and the results of behavioral thresholds. The correction coefficients for measuring ASSR thresholds and behavioral thresholds in free field in normal hearing adults have been obtained.

The Auditory Steady-State Response: Full-Term and Premature Neonates

2002 ◽  
Vol 13 (05) ◽  
pp. 260-269 ◽  
Author(s):  
Barbara Cone-Wesson ◽  
John Parker ◽  
Nina Swiderski ◽  
Field Rickards
Keyword(s):  
Steady State ◽  
Premature Infants ◽  
Modulation Frequency ◽  
Otoacoustic Emission ◽  
Full Term ◽  
Steady State Response ◽  
Pass Rates ◽  
Term Infants ◽  
State Response ◽  
Auditory Steady State Response

Two studies were aimed at developing the auditory steady-state response (ASSR) for universal newborn hearing screening. First, neonates who had passed auditory brainstem response, transient evoked otoacoustic emission, and distortion-product otoacoustic emission tests were also tested with ASSRs using modulated tones that varied in frequency and level. Pass rates were highest (> 90%) for amplitude-modulated tones presented at levels ≥ 69 dB SPL. The effect of modulation frequency on ASSR for 500- and 2000-Hz tones was evaluated in full-term and premature infants in the second study. Full-term infants had higher pass rates for 2000-Hz tones amplitude modulated at 74 to 106 Hz compared with pass rates for a 500-Hz tone modulated at 58 to 90 Hz. Premature infants had lower pass rates than full-term infants for both carrier frequencies. Systematic investigation of ASSR threshold and the effect of modulation frequency in neonates is needed to adapt the technique for screening.

Decreased Gamma Auditory Steady-State Response Is Associated With Impaired Real-World Functioning in Unmedicated Patients at Clinical High Risk for Psychosis

2020 ◽  
pp. 155005942098270
Author(s):  
Sarah Ahmed ◽  
Jennifer R. Lepock ◽  
Romina Mizrahi ◽  
R. Michael Bagby ◽  
Cory J. Gerritsen ◽  
...  
Keyword(s):  
Steady State ◽  
High Risk ◽  
Functional Impairment ◽  
Real World ◽  
Steady State Response ◽  
Clinical High Risk ◽  
State Response ◽  
Auditory Steady State Response ◽  
Gamma Synchrony ◽  
40 Hz

Aim Deficits in synchronous, gamma-frequency neural oscillations may contribute to schizophrenia patients’ real-world functional impairment and can be measured electroencephalographically using the auditory steady-state response (ASSR). Gamma ASSR deficits have been reported in schizophrenia patients and individuals at clinical high risk (CHR) for developing psychosis. We hypothesized that, in CHR patients, gamma ASSR would correlate with real-world functioning, consistent with a role for gamma synchrony deficits in functional impairment. Methods A total of 35 CHR patients rated on Global Functioning: Social and Role scales had EEG recorded while listening to 1-ms, 93-dB clicks presented at 40 Hz in 500-ms trains, in response to which 40-Hz evoked power and intertrial phase-locking factor (PLF) were measured. Results In CHR patients, lower 40-Hz PLF correlated with lower social functioning. Conclusions Gamma synchrony deficits may be a biomarker of real-world impairment at early stages of the schizophrenia disease trajectory.

40 Hz auditory steady-state response in schizophrenia: Sensitivity to stimulation type (clicks versus flutter amplitude-modulated tones)

2018 ◽  
Vol 662 ◽  
pp. 152-157 ◽  
Author(s):  
Inga Griskova-Bulanova ◽  
Kastytis Dapsys ◽  
Sigita Melynyte ◽  
Aleksandras Voicikas ◽  
Valentinas Maciulis ◽  
...  
Keyword(s):  
Steady State ◽  
Steady State Response ◽  
State Response ◽  
Auditory Steady State Response ◽  
40 Hz
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