scholarly journals Event-related potentials during contralateral switching over motor programs in humans

2020 ◽  
Vol 11 (1) ◽  
pp. 110-115
Author(s):  
O. V. Korzhyk ◽  
O. R. Dmutrotsa ◽  
A. I. Poruchynskyi ◽  
A. H. Morenko
Keyword(s):  
Left Hemisphere ◽  
Motor Response ◽  
Event Related Potentials ◽  
Motor Programs ◽  
Men And Women ◽  
Motor Responses ◽  
Parietal Lobes ◽  
Related Potentials ◽  
Visual Motor ◽  
The Right

The study of processes related to the motor response suppression and the evaluation of the next, alternative, response after termination of the already observed initial motor response is of significant interest to modern scientists. The objective of our research is to identify the gender-specific features of the amplitude-time characteristics of induced cortical electrical activity in the process of the excitation of the motor programs of manual movement. Healthy and right-handed men and women aged 18–23 participated in the research. The research tasks investigated the time of simple and complex visual-motor responses, amplitude-temporal features of N2 and P3 components of cognitive evoked potentials in the response to launch and contralateral switching (dominant or subdominant arm) of the motor program of finger flexes (pressing the remote control button) in the Stop-Change paradigm. Event-related potentials (ERPs) were analyzed in the frontal, central, and parietal lobes of the cortex. It was established that male participants had lower time indexes of simple and complex visual-motor responses than women. In addition, during the contralateral switching of motor programs of manual movements the smaller latent periods of the ERPs components in the right central and left frontal sections (component N2), in the left hemisphere lobes (component P3) among men were observed. The amplitudes of the N2 and P3 components revealed higher values in male participants at the parietal lobes. Thus, the process of recognizing and differentiating the stimulus among men was faster, with more powerful focus and attention on the operative memory. In the left hemisphere of men and women the smaller latent periods of P3component (in the central lobe) and amplitudes of N2 and P3 components were determined compared to the right hemisphere. Thus, the motor programs switching in the paradigm of the experiment occurred with the sequential activation of the left and contralateral right hemispheres.

P300 Event-Related Potentials in Stutterers and Nonstutterers

1997 ◽  
Vol 40 (6) ◽  
pp. 1334-1340 ◽  
Author(s):  
Michael D. Morgan ◽  
Jerry L. Cranford ◽  
Kenneth Burk
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Event Related Potentials ◽  
Event Related Potential ◽  
Related Potentials ◽  
The Right ◽  
Tonal Stimuli ◽  
P300 Event Related Potential

This study investigated possible differences between adult stutterers and nonstutterers in the P300 event-related potential. Responses to tonal stimuli were recorded from electrodes placed over the left (C3) and right (C4) hemispheres. The two groups exhibited different patterns of interhemispheric activity. Although all 8 participants in the fluent group exhibited P300s that were higher in amplitude over the right hemisphere, 5 of the 8 disfluent participants had higher amplitude activity over the left hemisphere. These results provide evidence that stutterers and nonstutterers may exhibit differences between hemispheres in the processing of some types of nonlinguistic (tonal) stimuli.

Late Positive Event-Related Potentials after Commissural Section in Humans

1990 ◽  
Vol 2 (3) ◽  
pp. 258-271 ◽  
Author(s):  
Marta Kutas ◽  
Steven A. Hillyard ◽  
Bruce T. Volpe ◽  
Michael S. Gazzaniga
Keyword(s):  
Corpus Callosum ◽  
Left Hemisphere ◽  
Visual Fields ◽  
Event Related Potentials ◽  
Auditory Oddball ◽  
Oddball Task ◽  
Related Potentials ◽  
The Individual ◽  
The Right ◽  
Auditory Oddball Task

The lateral distribution of the P300 component of the event-related brain potential (ERP) was studied in five epileptic patients whose corpus callosum had been surgically sectioned and in seven neurologically intact controls. The P300 was elicited in an auditory “oddball” task using high- and low-pitched tones and in a visual oddball task in which target words were presented either to the left or right visual fields, or to both fields simultaneously. Commissurotomy altered the normal pattern of bilaterally symmetrical P300 waves over the left and right hemispheres, but in a different manner for auditory and visual stimuli. The auditory P3 to binaural tones was larger in amplitude over the right than the left hemisphere for the patients. In the visual task, the laterality of the P300 varied with the visual field of the target presentation. Left field targets elicited much larger P300 amplitudes over the right than the left hemisphere, as did bilateral targets. In contrast, right field targets triggered P300 waves of about the same amplitude over the two hemispheres. The overall amplitude of the P300 to simultaneous bilateral targets was less than the sum of the individual P300 amplitudes produced in response to the unilateral right and left field targets. These shifts in P300 laterality argue against the view that the P300 is an index of diffuse arousal or activation that is triggered in both hemispheres simultaneously irrespective of which hemisphere processes the target information. The results further demonstrate that the P300 does not depend for its production on interhemispheric comparisons of information mediated by the corpus callosum, as suggested recently by Knight et al. (1989).

scholarly journals Preattentive detection of auditory memory representations in accumulative drinker

2020 ◽  
Vol 11 (1) ◽  
pp. 85-89
Author(s):  
Phakkharawat Sittiprapaporn
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Standard Stimulus ◽  
Event Related Potentials ◽  
Auditory Memory ◽  
Middle Temporal Gyrus ◽  
Monosyllabic Words ◽  
Related Potentials ◽  
The Right ◽  
Language Universal

Background: Chinese and English listeners did not show the same left-hemisphere (LH) lateralization as Thai listeners when making perceptual judgments of Thai tones. Although the left hemisphere is selectively employed for processing linguistic information irrespectively of acoustic cues or subtype of phonological unit, the right-hemisphere (RH) is employed for prosody-specific cues. Aims and Objective: As both hemispheres are lateralized for speech and language, the objective of this study is to extend the investigation of how the pre-attentive processing of contour tone changes of Thai monosyllabic words in alcoholic drinkers. Materials and Methods: Forty healthy right-handed adults participated in this study. Results: This study found that both rising-to-falling and falling-to-rising tone changes perception elicited Mismatch Negativity (MMN) between 217-264 msec with reference to the standard-stimulus Event-Related Potentials (ERPs). The rising-to-falling and falling-to-rising tone changes elicited a strong MMN for both groups. Source localization was obtained in the Middle Temporal Gyrus (MTG) of the right hemisphere (RH) for both groups. Conclusion: Automatic detection of changes in contour tones is a useful index of language universal auditory memory traces.

scholarly journals Study of interhemispheric interaction by the indices of event-related potentials

2020 ◽  
Vol 81 (2) ◽  
pp. 21-25
Author(s):  
G. Antsukh ◽  
T. Kutsenko ◽  
D. Nasiedkin ◽  
A. Pohrebna
Keyword(s):  
Left Hemisphere ◽  
Cognitive Task ◽  
Event Related Potentials ◽  
Anterior Cingulate ◽  
Previous Hypothesis ◽  
Contralateral Hand ◽  
Related Potentials ◽  
Reliable Marker ◽  
Irrelevant Color ◽  
The Right

The study used a combined Stroop test involving a spatial feature. Stimuli (the words "green", "red", "blue" and "yellow", written in relevant or irrelevant color) were presented to the right or left of the center of the screen. In the case of coincidence of the color of the word and its semantic meaning, it was necessary to press the button with the ipsilateral hand (answer "yes", congruent stimulus), discrepancies – with the contralateral hand (answer "no", incongruent stimulus). According to the results obtained earlier, it was suggested that it is easier to transfer information from the left hemisphere to the right than in the opposite direction, and the dominance of the left hemisphere when performing this type of cognitive task. To study this hypothesis, records of event-related potentials (ERP) were obtained when subjects performed this test. The subjects were 7 men, right-handed, aged 20 ± 1,13 years. The most informative was the registration from Cz, for which the components N450 and late positive complex (LPC) were obtained when stimulated by incongruent stimuli from the right side. The N450 component is associated with anterior cingulate cortex activity and is considered a reliable marker of conflict present in the experimental paradigm of this test. LPC is probably a component specific to the Stroop task and corresponds to the level of conflict of stimuli. Recording ERPs from the central lead does not allow to determine in this case the source of their origin. However, a comparison of ERP of incongruent stimuli from the right and left indicates differences in response to stimuli from different halves of the screen. The appearance of these components for incongruent stimuli exposed on the right side of the screen probably means their association with the functions of the left hemisphere, and confirms the previous hypothesis of metacontrol by the left hemisphere in this type of cognitive task.

scholarly journals Reduced Visual Magnocellular Event-Related Potentials in Developmental Dyslexia

2021 ◽  
Vol 11 (1) ◽  
pp. 48
Author(s):  
John Stein
Keyword(s):  
Steady State ◽  
Developmental Dyslexia ◽  
Reading Ability ◽  
Event Related Potentials ◽  
Black And White ◽  
Reverse Pattern ◽  
Related Potentials ◽  
The Right ◽  
Visual Hemifields ◽  
Electroencephalogram Eeg

(1) Background—the magnocellular hypothesis proposes that impaired development of the visual timing systems in the brain that are mediated by magnocellular (M-) neurons is a major cause of dyslexia. Their function can now be assessed quite easily by analysing averaged visually evoked event-related potentials (VERPs) in the electroencephalogram (EEG). Such analysis might provide a useful, objective biomarker for diagnosing developmental dyslexia. (2) Methods—in adult dyslexics and normally reading controls, we recorded steady state VERPs, and their frequency content was computed using the fast Fourier transform. The visual stimulus was a black and white checker board whose checks reversed contrast every 100 ms. M- cells respond to this stimulus mainly at 10 Hz, whereas parvocells (P-) do so at 5 Hz. Left and right visual hemifields were stimulated separately in some subjects to see if there were latency differences between the M- inputs to the right vs. left hemispheres, and these were compared with the subjects’ handedness. (3) Results—Controls demonstrated a larger 10 Hz than 5 Hz fundamental peak in the spectra, whereas the dyslexics showed the reverse pattern. The ratio of subjects’ 10/5 Hz amplitudes predicted their reading ability. The latency of the 10 Hz peak was shorter during left than during right hemifield stimulation, and shorter in controls than in dyslexics. The latter correlated weakly with their handedness. (4) Conclusion—Steady state visual ERPs may conveniently be used to identify developmental dyslexia. However, due to the limited numbers of subjects in each sub-study, these results need confirmation.

Asymmetry in Event-Related Potentials to Simulated Auditory Motion in Children, Young Adults, and Seniors

2002 ◽  
Vol 13 (01) ◽  
pp. 001-013 ◽  
Author(s):  
James Jerger ◽  
Rebecca Estes
Keyword(s):  
Young Adults ◽  
Right Hemisphere ◽  
Apparent Movement ◽  
Event Related Potentials ◽  
Auditory Evoked Responses ◽  
Age Related ◽  
Related Potentials ◽  
Velocity Information ◽  
The Right ◽  
Age Range

We studied auditory evoked responses to the apparent movement of a burst of noise in the horizontal plane. Event-related potentials (ERPs) were measured in three groups of participants: children in the age range from 9 to 12 years, young adults in the age range from 18 to 34 years, and seniors in the age range from 65 to 80 years. The topographic distribution of grand-averaged ERP activity was substantially greater over the right hemisphere in children and seniors but slightly greater over the left hemisphere in young adults. This finding may be related to age-related differences in the extent to which judgments of sound movement are based on displacement versus velocity information.

scholarly journals Automaticity of Early Sexual Attention: An Event-Related Potential Study

Sexual Abuse ◽  
2021 ◽  
pp. 107906322110242
Author(s):  
Anastasios Ziogas ◽  
Benedikt Habermeyer ◽  
Wolfram Kawohl ◽  
Elmar Habermeyer ◽  
Andreas Mokros
Keyword(s):  
Sexual Orientation ◽  
Sexual Interest ◽  
Event Related Potentials ◽  
Forensic Assessment ◽  
Event Related Potential ◽  
Behavioral Measures ◽  
Sexual Preferences ◽  
Motor Responses ◽  
Related Potentials ◽  
Promising Line

A promising line of research on forensic assessment of paraphilic sexual interest focuses on behavioral measures of visual attention using sexual stimuli as distractors. The present study combined event-related potentials (ERPs) with behavioral measures to investigate whether detection of a hidden sexual preference can be improved with ERPs. Normal variants of sexual orientation were used for a proof-of-concept investigation. Accordingly, 40 heterosexual and 40 gay men participated in the study. Within each group, half of the participants were instructed to hide their sexual orientation. The results showed that a match between sexual orientation and stimulus delays responses and influences ERP before motor responses. Late ERP components showed higher potential in differentiating hidden sexual preferences than motor responses, thereby showing how ERPs can be used in combination with reaction time measures to potentially facilitate the detection of hidden sexual preferences.

Syntactically Based Sentence Processing Classes: Evidence from Event-Related Brain Potentials

1991 ◽  
Vol 3 (2) ◽  
pp. 151-165 ◽  
Author(s):  
Helen Neville ◽  
Janet L. Nicol ◽  
Andrew Barss ◽  
Kenneth I. Forster ◽  
Merrill F. Garrett
Keyword(s):  
Left Hemisphere ◽  
Sentence Processing ◽  
Brain Activity ◽  
Phrase Structure ◽  
Event Related Potentials ◽  
Negative Potential ◽  
Developmental Studies ◽  
Brain Potentials ◽  
Related Potentials ◽  
Theoretical Considerations

Theoretical considerations and diverse empirical data from clinical, psycholinguistic, and developmental studies suggest that language comprehension processes are decomposable into separate subsystems, including distinct systems for semantic and grammatical processing. Here we report that event-related potentials (ERPs) to syntactically well-formed but semantically anomalous sentences produced a pattern of brain activity that is distinct in timing and distribution from the patterns elicited by syntactically deviant sentences, and further, that different types of syntactic deviance produced distinct ERP patterns. Forty right-handed young adults read sentences presented at 2 words/sec while ERPs were recorded from over several positions between and within the hemispheres. Half of the sentences were semantically and grammatically acceptable and were controls for the remainder, which contained sentence medial words that violated (1) semantic expectations, (2) phrase structure rules, or (3) WH-movement constraints on Specificity and (4) Subjacency. As in prior research, the semantic anomalies produced a negative potential, N400, that was bilaterally distributed and was largest over posterior regions. The phrase structure violations enhanced the N125 response over anterior regions of the left hemisphere, and elicited a negative response (300-500 msec) over temporal and parietal regions of the left hemisphere. Violations of Specificity constraints produced a slow negative potential, evident by 125 msec, that was also largest over anterior regions of the left hemisphere. Violations of Subjacency constraints elicited a broadly and symmetrically distributed positivity that onset around 200 msec. The distinct timing and distribution of these effects provide biological support for theories that distinguish between these types of grammatical rules and constraints and more generally for the proposal that semantic and grammatical processes are distinct subsystems within the language faculty.

scholarly journals ERP Evidence for a Sex-Specific Stroop Effect in Emotional Speech

2003 ◽  
Vol 15 (8) ◽  
pp. 1135-1148 ◽  
Author(s):  
Annett Schirmer ◽  
Sonja A. Kotz
Keyword(s):  
Semantic Processing ◽  
Event Related Potentials ◽  
Behavioral Effect ◽  
Emotional Prosody ◽  
Emotional Speech ◽  
Emotional Stimuli ◽  
Emotional Information ◽  
Men And Women ◽  
Related Potentials ◽  
Task Irrelevant

The present study investigated the interaction of emotional prosody and word valence during emotional comprehension in men and women. In a prosody-word interference task, participants listened to positive, neutral, and negative words that were spoken with a happy, neutral, and angry prosody. Participants were asked to rate word valence while ignoring emotional prosody, or vice versa. Congruent stimuli were responded faster and more accurately as compared to incongruent emotional stimuli. This behavioral effect was more salient for the word valence task than for the prosodic task and was comparable between men and women. The event-related potentials (ERPs) revealed a smaller N400 amplitude for congruent as compared to emotionally incongruent stimuli. This ERP effect, however, was significant only for the word valence judgment and only for female listeners. The present data suggest that the word valence judgment was more difficult and more easily influenced by task-irrelevant emotional information than the prosodic task in both men and women. Furthermore, although emotional prosody and word valence may have a similar influence on an emotional judgment in both sexes, ERPs indicate sex differences in the underlying processing. Women, but not men, show an interaction between prosody and word valence during a semantic processing stage.

scholarly journals Eye-Fixation-Related Potentials: Insight into Parafoveal Processing

2005 ◽  
Vol 19 (3) ◽  
pp. 204-215 ◽  
Author(s):  
Thierry Baccino ◽  
Yves Manunta
Keyword(s):  
Target Word ◽  
Cognitive Processes ◽  
Event Related Potentials ◽  
Semantic Relatedness ◽  
Word Type ◽  
Factors Affecting ◽  
Eye Fixation ◽  
Related Potentials ◽  
The Right ◽  
Nonword Processing

Abstract. This paper presents a new methodology for studying cognition, which combines eye movements (EM) and event-related potentials (ERP) to track the cognitive processes that occur during a single eye fixation. This technique, called eye-fixation-related potentials (EFRP), has the advantage of coupling accurate time measures from ERPs and the location of the eye on the stimulus, so it can be used to disentangle perceptual/attentional/cognitive factors affecting reading. We tested this new technique to describe the controversial parafoveal-on-foveal effects on reading, which concern the question of whether two consecutive words are processed in parallel or sequentially. The experiment directly addressed this question by looking at whether semantic relatedness on a target word in a reading-like situation might affect the processing of a prime word. Three pair-word conditions were tested: A semantically associated target word (horse-mare), a semantically nonassociated target word (horse-table) and a nonword (horse-twsui); EFRPs were compared for all conditions. The results revealed that early ERP components differentiated word and nonword processing within 119 ms postfixation (N1 component). Moreover, the amplitude of the right centrofrontal P140 varied as a function of word type, being larger in response to nonassociated words than to nonwords. This component might index a spatial attention shift to the target word and its visual categorization, being highly sensitive to orthographic regularity and “ill-formedness” of words. The P2 consecutive component (peaking at 215 ms) differentiated associated words and nonassociated words, which can account for the semantic parafoveal effect. The EFRP technique, therefore, appears to be fruitful for establishing a time-line of early cognitive processes during reading.

Sign in / Sign up

Export Citation Format

Share Document