scholarly journals Signal processing method for data with simultaneous recording of auditory brainstem response, middle latency response, and slow vertex response

2020 ◽  
Vol 41 (2) ◽  
pp. 517-520
Author(s):  
Katuhiro Maki ◽  
Tomoharu Ishikawa ◽  
Kazuki Kawakami
Keyword(s):  
Signal Processing ◽  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Simultaneous Recording ◽  
Processing Method ◽  
Middle Latency Response ◽  
Signal Processing Method ◽  
Brainstem Response ◽  
Latency Response ◽  
Middle Latency

Long-term course of Landau-Kleffner syndrome:

1999 ◽  
Vol 16 (1) ◽  
Author(s):  
Carla G. Matas ◽  
Renata A. Leite ◽  
Letícia L. Mansur ◽  
Laura M.F.F. Guilhoto ◽  
Maria Luiza G. Manreza
Keyword(s):  
Auditory Brainstem Response ◽  
Epileptic Seizures ◽  
Auditory Brainstem ◽  
Cognitive Domain ◽  
Speech Acquisition ◽  
Middle Latency Response ◽  
Brainstem Response ◽  
Latency Response ◽  
Middle Latency

Introduction. Landau-Kleffner Syndrome is characterized by normal speech acquisition followed by epileptic seizures, receptive and expressive language deterioration coupled with agnosia for non-verbal sounds, having variable long-term evolution. Case Report. It is described neurophysiologic and acoustic findings in a patient with Landau-Kleffner Syndrome, and correlate these with the results of a language evaluation carriedout 7 years after the acute phase. It is performed Electroencephalography, Immitance Measurements, Basic Audiometry, Auditory Brainstem Response, Middle Latency Response, and P300. Language was evaluated by Boston Diagnostic Aphasia Examination. Electroencephalography was normal and audiologic evaluation revealed normal Immitance Measurements, Basic Audiometry and Auditory Brainstem Response values. Anelectrode effect was present in the left hemisphere in Middle Latency Response, and bilateral P300 latencies delayed on the right. Language evaluation showed severe receptive and expressive impairment, severe phonemic substitutions, which had an impact on social and academic levels. There were contextual and gestual non-verbal compensations, evidencing intellectual and cognitive domain preservation. Conclusion. This case illustrates the specific cerebral areas that can be damaged in patients with Landau-Kleffner Syndrome and which are demonstrable by clinical evaluation and proper neurophysiology studies, showing the importance of neurological, audiological, electrophysiological and language exams in a longitudinal follow up.

scholarly journals Auditory evoked potentials as yardstick for tinnitus

2021 ◽  
Vol 7 (5) ◽  
pp. 789
Author(s):  
Shrutinath Banerjee ◽  
Nilanjan Paul ◽  
Indranil Chatterjee ◽  
Ishita Das ◽  
Rima Das ◽  
...  
Keyword(s):  
Auditory Evoked Potentials ◽  
Otoacoustic Emission ◽  
Prognostic Indicator ◽  
Auditory Brainstem ◽  
Tinnitus Retraining Therapy ◽  
Middle Latency Response ◽  
Retraining Therapy ◽  
Brainstem Response ◽  
Latency Response ◽  
Middle Latency

<p class="abstract"><strong>Background:</strong> Aiming to evaluate the recent theoretical postulates on tinnitus underscoring the role of thalamocortical neural tracts, the present study: explores middle latency response (MLR) as a possible physiological measure of tinnitus: thus investigates the predicted exaggeration of P<sub>a</sub>-N<sub>a</sub>, N<sub>a</sub>-P<sub>b</sub> interpeak amplitudes in tinnitus patients and; explores middle latency response (MLR) as a prognostic indicator of tinnitus retraining therapy (TRT), thus evaluates possible decrease in P<sub>a</sub>-N<sub>a</sub> and N<sub>a</sub>-P<sub>b</sub> amplitude after 2 weeks exposure to tinnitus retraining therapy.</p><p class="abstract"><strong>Methods:</strong> An experimental group was constructed by randomly assigning 30 patients with mean age 38.5 years and complaining of debilitating tinnitus but with normal hearing for the study. MLR was administered on patients with normal auditory brainstem response (ABR) and otoacoustic emission (OAE) both pre- and post-tinnitus retraining therapy.  </p><p class="abstract"><strong>Results:</strong> Results demonstrated no significant effect on P<sub>a</sub>, N<sub>a</sub> and N<sub>b</sub> absolute and interpeak latencies. However, significantly exaggerated P<sub>a</sub>-N<sub>a</sub> and N<sub>a</sub>-P<sub>b</sub> interpeak amplitudes between experimental and control groups as well as pre and post therapeutic groups were found.</p><p class="abstract"><strong>Conclusions:</strong> This proves that MLR may adequately reflect thalamocortical hyperactivity in cases with distressing tinnitus and demonstrable improvement post TRT warrants the use of MLR as its prognostic indicator.</p>

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