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.

Summed Evoked Responses Using Pure-Tone Stimuli

1966 ◽  
Vol 9 (2) ◽  
pp. 266-272 ◽  
Author(s):  
Geary A. McCandless ◽  
Lavar Best
Keyword(s):  
Pure Tone ◽  
Stimulus Frequency ◽  
Evoked Response ◽  
Evoked Responses ◽  
Response Patterns ◽  
Additional Advantage ◽  
Auditory Evoked Responses ◽  
Auditory Responses ◽  
Pure Tones ◽  
Major Consideration

Selected pure tones were used as stimuli in a study of evoked auditory responses in 25 adults. The effects of stimulus frequency, intensity, and duration on the evoked response were evaluated. Pure-tone stimuli appear to be as satisfactory as click stimuli in eliciting auditory evoked responses and have the additional advantage of providing more information relative to auditory function. Evoked response patterns were essentially the same for 500 Hz (cps), 2,000 Hz, and 4,000 Hz. Latencies were longer for the components of pure-tone-evoked responses than for click-evoked responses. Evoked responses may be influenced by (1) changes in stimulus parameters and (2) changes in subject’s psychophysical state. These variables become a major consideration in the recognition of the evoked response at intensity levels near threshold.

Masking Level Differences: Auditory Evoked Responses with Homophasic and Antiphasic Signal and Noise

1979 ◽  
Vol 22 (2) ◽  
pp. 403-411 ◽  
Author(s):  
A. Yonovitz ◽  
C. L. Thompson ◽  
Joseph Lozar
Keyword(s):  
Pure Tone ◽  
Evoked Response ◽  
Evoked Responses ◽  
Auditory Evoked Responses ◽  
Auditory Evoked Response ◽  
Level Difference ◽  
Masking Level Difference ◽  
Objective Quantification

Two studies were devised to determine if objective quantification of the masking level difference is possible using the auditory evoked response (AER). In the first study, click stimuli were presented under three conditions: both the stimulus and masker in phase (SoNo); stimulus in phase, masker antiphasic (SoN π ); and stimulus antiphasic with masker in phase (S π No). In the second study 1000 Hz pure-tone stimuli were presented under SoNo and S π No phasic conditions. AER’s were obtained at various intensity levels for each condition. The AER demonstrated differences in N 1 -P 2 amplitudes evoked by the homophasic and antiphasic conditions for threshold and suprathreshold levels.

Brainstem auditory evoked responses in rats with experimental chronic renal failure

1989 ◽  
Vol 76 (4) ◽  
pp. 415-417 ◽  
Author(s):  
Y. Shvili ◽  
U. Gafter ◽  
Y. Zohar ◽  
Y. P. Talmi ◽  
J. Levi
Keyword(s):  
Renal Failure ◽  
Chronic Renal Failure ◽  
Evoked Response ◽  
Evoked Responses ◽  
Neural Conduction ◽  
Auditory Evoked Responses ◽  
Auditory Evoked Response ◽  
Acoustic Nerve ◽  
Brainstem Auditory Evoked Response

1. Chronic renal failure was induced in rats by five-sixths nephrectomy. Brainstem auditory evoked response (BAER) was recorded after 3 months. 2. In the uraemic rats latency of the first wave was delayed, while the interpeak I-V latency was similar to that of the controls. 3. These results suggest a delayed neural conduction along the acoustic nerve or cochlear changes in uraemic rats.

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
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