scholarly journals Hemispheric contribution to vertex augmentation/reduction of the auditory evoked potential

1985 ◽  
Vol 43 (4) ◽  
pp. 347-354 ◽  
Author(s):  
C. Collin ◽  
F. Lolas
Keyword(s):  
Auditory Evoked Potentials ◽  
Evoked Potential ◽  
Right Hemisphere ◽  
Auditory Evoked Potential ◽  
Hemispheric Processing ◽  
Processing Mode ◽  
Subject Characteristic ◽  
Attention Deployment ◽  
Set Up ◽  
The Right

Starting off from the notion that the cerebral hemispheres differ in their processing mode, this paper reports on stimulus intensity modulation of auditory evoked potentials recorded from hemispheric leads (C3 and C4 referenced to ipsilateral mastoid processes) in a sample of 40 male Ss between 18 to 40 years of age. The experimental set up involved the recording of series of 100 trials to binaural clicks of 63.5, 74.6 and 85dB AL. Ss who were augmenters at the vertex showed positive Amplitude-Intensity function slopes over the left hemisphere; when Ss were Reducers at the vertex, the slopes were negative on the right hemisphere. These results are interpreted in terms of attention deployment or allocation to one or the other hemispheric processing mode. This might constitute a trait-like enduring subject characteristic whose relation to traditional psychometric variables needs further exploration. The modality especificity of this phenomenon is also discussed.

scholarly journals Middle latency auditory evoked potential in child population

2016 ◽  
Vol 26 (3) ◽  
pp. 368 ◽  
Author(s):  
Anna Caroline Silva de Oliveira ◽  
Simone Fiuza Regaçone ◽  
Ana Claudia Figueiredo Frizzo
Keyword(s):  
Evoked Potentials ◽  
Auditory Evoked Potentials ◽  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Electrode Position ◽  
Potential System ◽  
Significant Difference ◽  
Left And Right ◽  
Middle Latency ◽  
The Right

Introduction: The middle-latency auditory evoked potential is used to evaluate any abnormality that might impair the central auditory pathways, which are situated between the brain stem and the primary auditory cortex. Objective: To analyse the middle-latency auditory evoked potentials in children. Methods: This is a descriptive and cross-sectional study. Pure-tone audiometry was performed, and if no change was detected, Biologic’s portable Evoked Potential System (EP) was used to measure auditory evoked potentials. The identification of the responses was performed using electrodes positioned at C3 and C4 (left and right hemispheres) in reference to ears A1 and A2 (left and right earlobe). These were ipsilaterally and contralaterally paired and landed at Fpz (forehead), in two steps, with alternating stimulation of the right and left ears. Results: In this study, there was 100% detectability of the Na, Pa, and Nb components and interamplitude Na–Pa. This study compared different electrode leads, and there was no significant difference between the different electrode positions studied for the right and left ears in the studied population. Conclusion: It was concluded that the examination of middle-latency evoked potential is steady and feasible for the studied age group regardless of electrode position.

Auditory Distortion Products Measured With Averaged Auditory Evoked Potentials

1992 ◽  
Vol 35 (1) ◽  
pp. 157-166 ◽  
Author(s):  
Mark E. Chertoff ◽  
Kurt E. Hecox ◽  
Robert Goldstein
Keyword(s):  
High Frequency ◽  
Auditory Evoked Potentials ◽  
Evoked Potential ◽  
Low Frequency ◽  
Auditory Evoked Potential ◽  
Noise Floor ◽  
Distortion Products ◽  
Nonlinear Processing ◽  
Cochlear Damage ◽  
Primary Frequency

The purpose of this investigation was to describe the properties of averaged auditory evoked potential distortion products (AEP-DPs) in guinea pigs. This study provided a step toward developing a clinical index of nonlinear processing of auditory signals and supplied a baseline for studies evaluating the effect of cochlear damage on AEP-DPs. The amplitude of the AEP-DPs was evaluated as a function of f2/fl ratio (1.12–1.52) and primary frequency (500 Hz–2000 Hz). The amplitude of the AEP cubic difference tone (AEP-CDT) increased with increasing f2/fl ratio for the 500-Hz f1 primary and remained constant for the 800-Hz and 1700-Hz f1 primaries. The AEP-CDT generated by the 1100-Hz and 1400 Hz f1 primaries was maximum for the middle f2/fl ratios (1.22, 1.32, and 1.42). The AEP-CDT could not be distinguished from the noise floor for the 2000-Hz f1 primary. The AEP difference tone (AEP-DT) was larger and more frequently identified than the AEP-CDT. The amplitude of the AEP-DT decreased with an increase in f2/f1 ratio. The decrease was more pronounced for low-frequency f1 primaries than for high-frequency f1 primaries.

The Role of Cognitive and Hemispheric Processing Styles in L2 Learning

1989 ◽  
Vol 85-86 ◽  
pp. 105-121
Author(s):  
Cem Alptekin
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Hemispheric Processing ◽  
Processing Styles ◽  
Field Independent ◽  
Educational Implications ◽  
L2 Learners ◽  
Analytic Processing ◽  
The Right

L2 learners fall into two major categories in terms of their cognitive styles. The first group comprises the relatively analytical individuals, who are said to be predominantly field independent. The second group, on the other hand, embodies the relatively holistic persons, who are said to be chiefly field dependent. L2 learners are further classified in terms of their hemispheric processing styles. Some learners are left-hemisphere dominant while others are right-hemisphere dominant. The former are thought to be more efficient with analytic processing in which the left hemisphere specializes. By contrast, the latter are described as more efficient with holistic processing in which the right hemisphere specializes. After reviewing the available evidence for the associations between cognitive and hemispheric processing styles, the paper discusses the educational implications of L2 learners' differences with respect to cognitive and hemispheric dimensions.

scholarly journals Effects of stimulation intensity, gender and handedness upon auditory evoked potentials

1992 ◽  
Vol 50 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Susana Camposano ◽  
Fernando Lolas
Keyword(s):  
Corpus Callosum ◽  
Evoked Potentials ◽  
Stimulus Intensity ◽  
Auditory Evoked Potentials ◽  
Right Hemisphere ◽  
Cognitive Components ◽  
Left Handed ◽  
And Gender ◽  
The Right ◽  
Cortical Auditory Evoked Potentials

Left handers and women show less anatomical brain asymmetry, larger corpus callosum and more bilateral representation of specific functions. Sensory and cognitive components of cortical auditory evoked potentials (AEF) have been shown to be asymmetric in right handed males and to be influenced by stimulus intensity. In this study the influence of sex, handedness and stimulus intensity upon AEP components is investigated under basal conditions of passive attention. 14 right handed males, 14 right handed females, 14 left handed males, and 14 left handed females were studied while lying awake and paying passive attention to auditory stimulation (series of 100 binaural clicks, duration 1 msec, rate 1/sec, at four intensities). Cz, C3 and C4 referenced to linked mastoids and right EOG were recorded. Analysis time was 400 msec, average evoked potentials were based on 100 clicks. Stimulus intensity and gender affect early sensory components (P1N1 and N1P2) at central leads, asymmetry is influenced only by handedness, right handers showing larger P1N1 amplitudes over the right hemisphere.

Alpha Asymmetry over the Right and Left Hemispheres of Stutterers and Control Subjects Preceding Massed Oral Readings: A Preliminary Investigation

1977 ◽  
Vol 44 (1) ◽  
pp. 223-230 ◽  
Author(s):  
W. H. Moore ◽  
Mary K. Lang
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Preliminary Investigation ◽  
Hemispheric Processing ◽  
Preliminary Results ◽  
Alpha Asymmetry ◽  
Control Subjects ◽  
The Right ◽  
And Control

Interhemispheric alpha asymmetry of both stutterers and non-stutterers measured preceding each of five massed oral readings of the same material was investigated. Preliminary results indicated a reduction of alpha over the left hemisphere for non-stutterers, while a reduction for stutterers was found for the right hemisphere. Present results, together with other investigations using dichotic, tachistoscopic, and EEG procedures, suggest right hemispheric processing for the stuttering group as compared with left hemispheric processing for the non-stuttering group.

Direct brainstem recording of auditory evoked potentials during vestibular schwannoma resection: nuclear BAEP recording

1997 ◽  
Vol 86 (6) ◽  
pp. 1057-1062 ◽  
Author(s):  
Cordula Matthies ◽  
Madjid Samii
Keyword(s):  
Vestibular Schwannoma ◽  
Auditory Evoked Potentials ◽  
Evoked Potential ◽  
Conventional Technique ◽  
Auditory Evoked Potential ◽  
New Technique ◽  
Recording Site ◽  
Content Type ◽  
Direct Recording ◽  
A New Technique

✓ The usefulness of intraoperative monitoring in cerebellopontine angle surgery should be improved by obtaining faster and stronger brainstem auditory evoked potential (BAEP) responses. A new technique of direct recording at the brainstem has been developed, which is applicable to all tumor sizes. By placing a retractor with electrodes attached to its tip at the cerebellomedullary junction, the authors have recorded BAEP amplitudes that are 10 times greater than those recorded using the conventional technique. Only small sampling numbers (64–256 recordings) are required and are obtained in 5 to 15 seconds. The technique has been applied successfully in 34 patients who underwent vestibular schwannoma resections. It has also been tested in patients with intrameatal—extrameatal meningiomas and in those with vascular compressive disorders; there have been no false results. The advantages of this new technique are: 1) identification of BAEP components is easier and faster; 2) reliable BAEP responses are obtained in some cases in which conventional BAEP responses are lost or severely deformed; and 3) BAEP response deterioration and improvement are recognized earlier than would occur using the conventional technique. This last advantage provides the surgeon with a useful warning at a stage of surgery at which BAEP changes are still temporary and can be reversed. This method is different from other trials of intradural BAEP recordings in three respects: its use is not limited to particular tumor sizes; there is no interference with the surgical process; and, most important, the obtained responses correlate well with those of conventional BAEP responses, probably because the recording site is in the vicinity of the anterior cochlear nucleus. In conclusion, the chances of useful monitoring feedback with adequate adaptation of the microsurgical strategy are improved considerably.

scholarly journals Parameters for Applying the Brainstem Auditory Evoked Potential with Speech Stimulus: Systematic Review

2017 ◽  
Vol 22 (04) ◽  
pp. 460-468 ◽  
Author(s):  
Luísa Gabriel ◽  
Luíza Vernier ◽  
Maria Ferreira ◽  
Adriana Silveira ◽  
Márcia Machado
Keyword(s):  
Systematic Review ◽  
Evoked Potentials ◽  
Brain Stem ◽  
Auditory Evoked Potentials ◽  
Evoked Potential ◽  
Sampling Rate ◽  
Presentation Rate ◽  
Auditory Evoked Potential ◽  
Speech Stimulus ◽  
Brainstem Auditory Evoked Potential

Introduction Studies using the Brainstem Auditory Evoked Potential with speech stimulus are increasing in Brazil, and there are divergences between the methodologies used for testing. Objectives To analyze the parameters used in the study of the Brainstem Auditory Evoked Potentials with speech stimulus. Data Synthesis The survey was performed using electronic databases. The search strategy was as follows: “Evoked potentials, auditory” OR “Brain stem” OR “Evoked potentials, auditory, brain stem” AND “Speech.” The survey was performed from June to July of 2016. The criteria used for including articles in this study were: being written in Portuguese, English or Spanish; presenting the description of the testing parameters and the description of the sample. In the databases selected, 2,384 articles were found, and 43 articles met all of the inclusion criteria. The predominance of the following parameters was observed to achieve the potential during study: stimulation with the syllable /da/; monaural presentation with greater use of the right ear; intensity of 80 dB SPL; vertical placement of electrodes; use of in-ear headphones; patient seated, distracted in awake state; alternating polarity; use of speech synthesizer software for the elaboration of stimuli; presentation rate of 10.9/s; and sampling rate of 20 kHz. Conclusions The theme addressed in this systematic review is relatively recent. However, the results are significant enough to encourage the use of the procedure in clinical practice and advise clinicians about the most used procedures in each parameter.

scholarly journals Cortical Auditory Evoked Potentials with Simple (Tone Burst) and Complex (Speech) Stimuli in Children with Cochlear Implant

2017 ◽  
Vol 21 (04) ◽  
pp. 351-357
Author(s):  
Kelly Vasconcelos Martins ◽  
Daniela Gil
Keyword(s):  
Cochlear Implant ◽  
Auditory Evoked Potentials ◽  
Evoked Potential ◽  
Tone Burst ◽  
Auditory Evoked Potential ◽  
Aural Rehabilitation ◽  
Auditory Rehabilitation ◽  
Complex Stimuli ◽  
Significant Difference ◽  
Cortical Auditory Evoked Potential

Introduction The registry of the component P1 of the cortical auditory evoked potential has been widely used to analyze the behavior of auditory pathways in response to cochlear implant stimulation. Objective To determine the influence of aural rehabilitation in the parameters of latency and amplitude of the P1 cortical auditory evoked potential component elicited by simple auditory stimuli (tone burst) and complex stimuli (speech) in children with cochlear implants. Method The study included six individuals of both genders aged 5 to 10 years old who have been cochlear implant users for at least 12 months, and who attended auditory rehabilitation with an aural rehabilitation therapy approach. Participants were submitted to research of the cortical auditory evoked potential at the beginning of the study and after 3 months of aural rehabilitation. To elicit the responses, simple stimuli (tone burst) and complex stimuli (speech) were used and presented in free field at 70 dB HL. The results were statistically analyzed, and both evaluations were compared. Results There was no significant difference between the type of eliciting stimulus of the cortical auditory evoked potential for the latency and the amplitude of P1. There was a statistically significant difference in the P1 latency between the evaluations for both stimuli, with reduction of the latency in the second evaluation after 3 months of auditory rehabilitation. There was no statistically significant difference regarding the amplitude of P1 under the two types of stimuli or in the two evaluations. Conclusion A decrease in latency of the P1 component elicited by both simple and complex stimuli was observed within a three-month interval in children with cochlear implant undergoing aural rehabilitation.

Linguistic Processing and Reaction Time Differences in Stutterers and Nonstutterers

1983 ◽  
Vol 26 (2) ◽  
pp. 181-185 ◽  
Author(s):  
C. Rebekah Hand ◽  
William O. Haynes
Keyword(s):  
Right Hemisphere ◽  
Reaction Times ◽  
Decision Task ◽  
Linguistic Processing ◽  
Hemispheric Processing ◽  
Left And Right ◽  
Response Modes ◽  
Field Efficiency ◽  
The Right ◽  
Visual Hemifields

Linguistic processing by the left and right cerebral hemispheres was investigated in 10 adult male stutterers and l0 matched nonstutterers. Subjects performed a lexical decision task in which nonword and real-word stimuli were presented tachistoscopically to the right and left visual hemifields. Vocal and manual reaction times to real words were measured to assess hemispheric participation in processing linguistic information and to determine differences between response modes. The stuttering group exhibited a left visual field efficiency or right hemisphere preference for this task and were slower in both vocal and manual reaction times. Ramifications for hemispheric processing theories and laryngeal dysfunction hypothesis are discussed.

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