Brainstem auditory evoked responses in man. I. Effect of stimulus rise–fall time and duration

1976 ◽  
Vol 60 (5) ◽  
pp. 1187-1192 ◽  
Author(s):  
Kurt Hecox ◽  
Nancy Squires ◽  
Robert Galambos
Keyword(s):  
Evoked Responses ◽  
Fall Time ◽  
Auditory Evoked Responses

Effects of Rise-Fall Time, Frequency, and Intensity on the Early/Middle Evoked Response

1984 ◽  
Vol 49 (2) ◽  
pp. 114-127 ◽  
Author(s):  
Randall C. Beattie ◽  
Margaret Moretti ◽  
Virginia Warren
Keyword(s):  
Evoked Response ◽  
Evoked Responses ◽  
Fall Time ◽  
Auditory Evoked Responses ◽  
Time Frequency ◽  
Frequency Specificity ◽  
Band Pass

Auditory evoked responses to tone pips were recorded on 10 normally hearing adults. Tone pips centered at 500 and 2000 Hz with 1, 2, and 4 ms rise-fall times were presented at intensities of 40, 30, 20, and 10 dB nHL. The band-pass of the recording-amplifier system was set to 55 and 3000 Hz. Responses were measured during the first 25 ms following the onset of the stimulus and the first three prominent waves were labeled P10, N15, and P20. The results indicated that varying rise-fall times from 1 to 4 ms had little effect on the detectability of these waves. Consequently, the 4-ms rise-fall time was recommended because of its greater frequency specificity. The number of identifiable responses was similar for both 500 and 2000 Hz for waves P10, N15, and P20. The similarity in the number of detectable responses suggests that any of these waves may be used as a threshold indicator. The acoustic/physiologic mechanisms underlying the latency changes are discussed.

Brain Stem Auditory Evoked Responses

2009 ◽  
Vol 62 (1) ◽  
pp. 64-64
Author(s):  
Khalil Kayed ◽  
Reidar Kloster
Keyword(s):  
Brain Stem ◽  
Evoked Responses ◽  
Auditory Evoked Responses

State-Dependent Variations in Brainstem Auditory Evoked Responses in Human Subjects

1984 ◽  
Vol 59 (3) ◽  
pp. 731-738 ◽  
Author(s):  
E. A. Sersen ◽  
J. Majkowski ◽  
J. Clausen ◽  
G. M. Heaney
Keyword(s):  
Clinical Significance ◽  
Human Subjects ◽  
General Tendency ◽  
Evoked Responses ◽  
Brain Areas ◽  
Auditory Evoked Responses ◽  
State Dependent

BAERs from 16 subjects during 3 sessions varied in the latency or amplitude of some components depending upon level of arousal as indicated by EEG patterns. There was a general tendency for activation to produce the fastest responses with the largest amplitudes and for drowsiness to produce the slowest responses with the smallest amplitudes. The latency of P2 was significantly prolonged during drowsiness, relative to those during relaxation or activation. For right-ear stimulation, P5 latency was longest during drowsiness, and shortest during activation while for left-ear stimulation the shortest latency occurred during relaxation. The amplitudes of Wave II and Wave VII were significantly smaller during drowsiness than during activation. Although the differences were below the level of clinical significance, the data indicate a modification in the characteristics of brainstem transmission as a function of concurrent activity in other brain areas.

Neonatal risk factors and risk scores including auditory evoked responses

1998 ◽  
Vol 157 (3) ◽  
pp. 230-235 ◽  
Author(s):  
J. W. Pasman ◽  
J. J. Rotteveel ◽  
B. Maassen ◽  
R. de Graaf ◽  
A. A. Kollée
Keyword(s):  
Risk Factors ◽  
Risk Scores ◽  
Evoked Responses ◽  
Auditory Evoked Responses ◽  
Neonatal Risk Factors

Auditory Evoked Responses in Normal Hearing Adults and Children Before and During Sedation

1969 ◽  
Vol 12 (2) ◽  
pp. 394-401 ◽  
Author(s):  
Paul Skinner ◽  
Frank Antinoro
Keyword(s):  
Preschool Children ◽  
Evoked Potential ◽  
Normal Hearing ◽  
Auditory Stimuli ◽  
Evoked Responses ◽  
Auditory Evoked Responses ◽  
Adults And Children ◽  
Awake Condition ◽  
Wave Complex ◽  
Prominent Peak

Averaged evoked responses (AER) to auditory stimuli presented to young children and adults were compared between awake and induced sleep conditions. Eight adults and twenty preschool children with normal hearing were tested before and during sedation at two suprathreshold levels with tone pips centered at 510, 1020, and 2040 Hz. Responses obtained during sedation assumed a distinctly different wave complex than those obtained under the awake condition. The P2 peak that is most prominent in the AERs obtained from awake subjects was diminished considerably under sedation and P3 became the prominent peak. Moreover, the P3 peaks in the AERs obtained under sedation were of considerably greater amplitude than the P2 peaks obtained in the awake condition. In all cases where responses were obtained from awake subjects, greater amplitude responses were obtained during sedation. The use of sedation with the preschool children proved to be most important in obtaining more detectable responses and permitting evoked potential audiometry with otherwise unmanageable children.

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