The Associations Between 40 Hz-EEG and the Middle Latency Response of the Auditory Evoked Potential

1987 ◽  
Vol 33 (1-2) ◽  
pp. 103-117 ◽  
Author(s):  
E. Başar ◽  
B. Rosen ◽  
C. Başar-Eroglu ◽  
F. Greitschus
Keyword(s):  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Middle Latency Response ◽  
Latency Response ◽  
Middle Latency ◽  
40 Hz

scholarly journals The Middle Latency Response: A Review of Findings in Various Central Nervous System Lesions

2018 ◽  
Vol 29 (09) ◽  
pp. 855-867 ◽  
Author(s):  
Frank Musiek ◽  
Stephanie Nagle
Keyword(s):  
Nervous System ◽  
Auditory System ◽  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Central Auditory System ◽  
Auditory Brain Stem Response ◽  
Potential Value ◽  
Middle Latency Response ◽  
Latency Response ◽  
Middle Latency

AbstractThe middle latency response (MLR) first came to light as an auditory evoked potential in 1958. Since then, it has aroused substantial interest and investigation by clinicians and researchers alike. In recent history, its use and popularity have dwindled in tandem with various other auditory evoked potentials in audiology. One area for which MLR research and application has been overlooked is its potential value in measuring the neural integrity of the auditory thalamocortical pathway. In a broader sense, the MLR, when combined with the auditory brain stem response, can provide information concerning the status of much of the central auditory system pathways. This review is intended to provide information concerning the MLR as a measure of central auditory function for the reader to consider.To review and synthesize the scientific literature regarding the potential value of the MLR in assessing the integrity of the central auditory system and to provide the reader an informed perspective on the value of the MLR in this regard. Information is also provided on the MLR generator sites and fundamental characteristics of this evoked potential essential to its clinical and or research application.A systematic review and synthesis of the literature focusing on the MLR and lesions of the central auditory system.Studies and individual cases were reviewed and analyzed that evidenced documented lesions of the central auditory nervous system.The authors searched and reviewed the literature (journal articles, book chapters, and books) pertaining to central auditory system lesion effects on the MLR.Although findings varied from study to study, overall, the MLR was reasonably sensitive and specific to neurological compromise of the central auditory system. This finding is consistent with the generator sites of this evoked potential.The MLR is a valuable tool for assessing the integrity of the central auditory system. It should be of interest to the clinician or researcher who focuses their attention on the function and dysfunction of the higher auditory system.

Synthesis of the auditory 40 Hz rhythm from individual middle latency response components

1993 ◽  
Vol 14 (2) ◽  
pp. 145
Author(s):  
J.W. Rohrbaugh ◽  
J.L. Varner ◽  
S.K. Law ◽  
E.A. Zubovic ◽  
M.J. Eckardt
Keyword(s):  
Middle Latency Response ◽  
Latency Response ◽  
Middle Latency ◽  
40 Hz

scholarly journals Influence of Auditory Stimulation Rates on Evoked Potentials during General Anesthesia

2009 ◽  
Vol 110 (5) ◽  
pp. 1026-1035 ◽  
Author(s):  
Richard R. McNeer ◽  
Jorge Bohórquez ◽  
Özcan Özdamar
Keyword(s):  
Steady State ◽  
General Anesthesia ◽  
Stimulus Presentation ◽  
Quantitative Relation ◽  
Middle Latency Response ◽  
Auditory Middle Latency Response ◽  
Latency Response ◽  
Middle Latency ◽  
Composite Nature ◽  
40 Hz

Background The auditory middle-latency response (transient) and the 40-Hz auditory steady state response (ASSR) are modulated by anesthetics. However, the quantitative relation between these evoked responses is difficult to obtain because of technical limitations of the recording methods used to obtain transients at high stimulation rates. This study uses continuous-loop averaging deconvolution to fill this technical gap and to study the relation between the transient and ASSR waveform during general anesthesia. Methods The authors recorded 5- and 40-Hz transients and 40-Hz ASSRs in 13 subjects during general anesthesia. The 5- and 40-Hz transients were used to predict the 40-Hz ASSR by linearly superimposing the transient waveforms. The predicted and recorded ASSRs were analyzed and compared using phasor and Hotelling T(2) analyses. Results Grand-averaged recordings revealed differences in the early middle-latency peaks between 5- and 40-Hz transients, e.g., the peak P(x) was present only in 5-Hz transient. Only the predicted 40-Hz ASSR derived from the 40-Hz transient matched the actual ASSR. Phasor analysis showed that the early peaks contribute significantly to the steady state waveform, and this explains why 5-Hz transient does not predict the 40-Hz ASSR. Oscillations in both the 5- and 40-Hz transients were observed during anesthesia. Discussion The 40-Hz ASSR represents a composite waveform and arises when transient waveforms elicited with a 40-Hz stimulation rate are overlapped and superimposed. During general anesthesia, the morphology of the transient is dependent on the rate of stimulus presentation. The composite nature of the ASSR may explain nonmonotonic anesthetic dose-response relations observed by others.

Electrophysiologic Assessment of Low-Frequency Hearing: Sedation Effects

1989 ◽  
Vol 101 (4) ◽  
pp. 434-441 ◽  
Author(s):  
Constantine W. Palaskas ◽  
Michael J. Wilson ◽  
Robert A. Dobie
Keyword(s):  
Cross Correlation ◽  
Low Frequency ◽  
Correlation Method ◽  
Normal Hearing ◽  
Hearing Level ◽  
Evoked Responses ◽  
Middle Latency Response ◽  
Latency Response ◽  
Middle Latency ◽  
40 Hz

Sixteen normal-hearing adults were tested in both awake and sedated states for several evoked responses to low-frequency stimuli. Responses obtained by cross-correlation function, middle latency responses, and the 40-Hz response proved most sensitive; all had mean thresholds of less than 20 dB normal hearing level for the awake-alert state, but 40-Hz and middle latency response mean thesholds were shifted about 10 dB under sedation. The cross-correlation method seems to offer promise for pediatric auditory assessment.

Attenuated human auditory middle latency response and evoked 40-Hz response to self-initiated sounds

2009 ◽  
Vol 29 (7) ◽  
pp. 1514-1521 ◽  
Author(s):  
Pamela Baess ◽  
Andreas Widmann ◽  
Anja Roye ◽  
Erich Schröger ◽  
Thomas Jacobsen
Keyword(s):  
Middle Latency Response ◽  
Auditory Middle Latency Response ◽  
Latency Response ◽  
Middle Latency ◽  
40 Hz
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