Frontal and Posterior Erps Related to Line Bisection

2007 ◽  
Vol 105 (2) ◽  
pp. 587-608 ◽  
Author(s):  
Metehan Çiçek ◽  
Ereian Nalçaci ◽  
Canan Kalaycioğlu
Keyword(s):  
Prefrontal Cortex ◽  
Slow Wave ◽  
Test Performance ◽  
Right Hemisphere ◽  
Event Related Potentials ◽  
Line Bisection ◽  
Spatial Processing ◽  
Dynamic Nature ◽  
Related Potentials ◽  
The Right

The aim of this study was to investigate the dynamic nature of the cortical visuospatial attention processes during the line bisection test, which is sensitive to perceptual asymmetries. EEGs of 26 normal volunteers were recorded during the administration of a computerized line bisection test, which requires participants mark the midline of lines using a mouse. Two event-related potentials subsequent and time locked to the line presentations, namely, P300 and a positive slow wave, were obtained. Findings suggested that both potentials were related to the test performance, and the right hemisphere was more active. Analysis suggested a right parietotemporal and superior parietal locus for the P300 and right prefrontal activity for the positive slow wave. A dynamic asymmetrical activity was identified, such that after primary visual perception, spatial processing is then initiated in the right parietotemporal cortex and then proceeds to the right prefrontal cortex.

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.

Frontal Brain Activity during Episodic and Semantic Retrieval: Insights from Event-Related Potentials

1999 ◽  
Vol 11 (6) ◽  
pp. 598-609 ◽  
Author(s):  
Charan Ranganath ◽  
Ken A. Paller
Keyword(s):  
Prefrontal Cortex ◽  
Memory Retrieval ◽  
Brain Activity ◽  
Novelty Detection ◽  
Event Related Potentials ◽  
Episodic Retrieval ◽  
Semantic Retrieval ◽  
Retrieval Task ◽  
Related Potentials ◽  
The Right

Previous neuropsychological and neuroimaging results have implicated the prefrontal cortex in memory retrieval, although its precise role is unclear. In the present study, we examined patterns of brain electrical activity during retrieval of episodic and semantic memories. In the episodic retrieval task, participants retrieved autobiographical memories in response to event cues. In the semantic retrieval task, participants generated exemplars in response to category cues. Novel sounds presented intermittently during memory retrieval elicited a series of brain potentials including one identifiable as the P3a potential. Based on prior research linking P3a with novelty detection and with the frontal lobes, we predicted that P3a would be reduced to the extent that novelty detection and memory retrieval interfere with each other. Results during episodic and semantic retrieval tasks were compared to results during a task in which subjects attended to the auditory stimuli. P3a amplitudes were reduced during episodic retrieval, particularly at right lateral frontal scalp locations. A similar but less lateralized pattern of frontal P3a reduction was observed during semantic retrieval. These findings support the notion that the right prefrontal cortex is engaged in the service of memory retrieval, particularly for episodic memories.

The dysfunction of affective picture processing in pituitary patients: an ERPs study

2020 ◽  
Author(s):  
Chenglong Cao ◽  
Jian Song ◽  
Binbin Liu ◽  
Jianren Yue ◽  
Yuzhao Lu ◽  
...  
Keyword(s):  
Pituitary Adenoma ◽  
Patient Group ◽  
Electric Potential ◽  
Emotional Processing ◽  
Right Hemisphere ◽  
Event Related Potentials ◽  
Emotional Stimuli ◽  
Affective Stimuli ◽  
Related Potentials ◽  
The Right

Abstract Background: Cognitive impairments have been reported in patients with pituitary adenoma; however, there is a lack of knowledge of investigating the emotional stimuli processing in pituitary patients. Thus, we aimed to investigate whether there is emotional processing dysfunction in pituitary patients by recording and analyzing the late positive potential (LPP) elicited by affective stimuli.Methods: Evaluation of emotional stimuli processing by LPP Event related potentials (ERPs) was carried out through central- parietal electrode sites (C3, Cz, C4, P3, Pz, P4) on the head of the patients and healthy controls (HCs).Results: In the negative stimuli, the amplitude of LPP was 2.435 ± 0.419μV for HCs and 0.656 ± 0.427μV for patient group respectively ( p = 0.005). In the positive stimuli, the elicited electric potential 1.450 ± 0.316μV for HCs and 0.495 ± 0.322μV for patient group respectively ( p = 0.040). Moreover, the most obvious difference of LPP amplitude between the two groups existed in the right parietal region. On the right hemisphere (at the P4 site), the elicited electric potential was 1.993 ± 0.299μV for HCs and 0.269 ± 0.305μV for patient group respectively( p = 0.001).Conclusion: There are functional dysfunction of emotional stimuli processing in pituitary adenoma patients. Our research provides the electrophysiological evidence for the presence of cognitive dysfunction which need to be intervened in the pituitary adenoma patients.

Spatiotemporal Human Brain Activities on Recalling Names of Body Parts

2013 ◽  
Vol 17 (3) ◽  
pp. 386-391 ◽  
Author(s):  
Takahiro Yamanoi ◽  
◽  
Yoshinori Tanaka ◽  
Mika Otsuki ◽  
Shin-ichi Ohnishi ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Event Related Potentials ◽  
Angular Gyrus ◽  
Middle Temporal Gyrus ◽  
Dipole Source ◽  
Body Parts ◽  
Current Dipole ◽  
Middle Temporal ◽  
Related Potentials ◽  
The Right

The authors measure electroencephalograms (EEGs) from a subject looking at line drawings of body parts and recalling their names silently. The equivalent current dipole source localization (ECDL) method is applied to the event related potentials (ERPs): summed EEGs. As the dominant language area of the subject is considered to be in the right hemisphere in the previous research study, ECDs are localized to the right middle temporal gyrus: the angular gyrus. Then ECDs are localized to the right fusiform gyrus, the right middle temporal pole (TEP), and the right inferior temporal white matter (TWM). ECDs are located in the ventral pathway. The areas are related to the integrated process of visual recognition of pictures and the recalling of words. Some of these areas are also related to image recognition and word generation.

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.

scholarly journals Evidence for a general neural signature of face familiarity

2021 ◽  
Author(s):  
Alexia Dalski ◽  
Gyula Kovács ◽  
Géza Gergely Ambrus
Keyword(s):  
Right Hemisphere ◽  
Time Window ◽  
Event Related Potentials ◽  
Central Regions ◽  
Related Potentials ◽  
The Media ◽  
Neural Signature ◽  
Cross Experiment ◽  
Strong Candidate ◽  
The Right

We explored the neural signatures of face familiarity using cross-participant and cross-experiment decoding of event-related potentials, evoked by unknown and experimentally familiarized faces from a set of experiments with different participants, stimuli, and familiarization-types. Participants were either familiarized perceptually, via media exposure, or by personal interaction. We observed significant cross-experiment familiarity decoding involving all three experiments, predominantly over posterior and central regions of the right hemisphere in the 270 - 630 ms time window. This shared face familiarity effect was most prominent between the Media and Personal, as well as between the Perceptual and Personal experiments. Cross-experiment decodability makes this signal a strong candidate for a general neural indicator of face familiarity, independent of familiarization methods and stimuli. Furthermore, the sustained pattern of temporal generalization suggests that it reflects a single automatic processing cascade that is maintained over time.

Emotional Modulation of Response Inhibition in Adolescents During Acute Suicidal Crisis: Event-Related Potentials in an Emotional Go/NoGo Task

2021 ◽  
pp. 155005942110633
Author(s):  
Meggan Porteous ◽  
Paniz Tavakoli ◽  
Kenneth Campbell ◽  
Allyson Dale ◽  
Addo Boafo ◽  
...  
Keyword(s):  
Emotional Processing ◽  
Right Hemisphere ◽  
Event Related Potentials ◽  
Control Group ◽  
Strongly Correlated ◽  
Emotional Modulation ◽  
Lower Amplitude ◽  
Related Potentials ◽  
The Right ◽  
Suicidal Crisis

Objectives. Suicide is the second leading cause of adolescent deaths and may be linked to difficulties with inhibitory and emotional processing. This study assessed the neural correlates of cognitive inhibition during emotional processing in adolescents hospitalized for a suicidal crisis. Methods. Event-related potentials were recorded during an emotional Go/NoGo task in 12 adolescents who attempted suicide and 12 age- and sex-matched healthy controls. Results. Compared to the control group, the suicidal group showed significantly reduced positivity at the time of the P3d (difference waveform reflecting NoGo minus Go trials) in response to happy and neutral, but not sad stimuli. For happy stimuli, this group difference was restricted to the right hemisphere. Further analyses indicated that the suicidal group had a reversed pattern of P3 amplitude in response to inhibition, with lower amplitudes in the NoGo compared to the Go conditions. Suicidal symptoms severity strongly correlated with lower amplitude of the P3d in response to neutral faces. Conclusions. These findings provide more insight into inhibition difficulties in adolescents with acute suicidal risk. Interactions between emotional and inhibition processing should be considered when treating acutely suicidal youths.

Difference in Areas of the Brain for Fuzzy and Crisp Calculation

2002 ◽  
Vol 6 (1) ◽  
pp. 51-55 ◽  
Author(s):  
Takahiro Yamanoi ◽  
◽  
Masaaki Saito ◽  
Michio Sugeno ◽  
EIie Sanchez ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Event Related Potentials ◽  
Type A ◽  
Peak Latency ◽  
Dipole Source ◽  
Type B ◽  
Current Dipole ◽  
Significant Difference ◽  
Related Potentials ◽  
The Right

We recorded event-related potentials (ERPs) by electroencephalography (EEG) during fuzzy and crisp calculation. Questions art divided into 2 types. As type A, questions were presented as sentences. Questions of type B were presented as numerical calculation. In type A, the peak latency of the EEG was around 1100ms. In type B, the peak latency was around 650ms. In type A, from multiple equivalent current dipole source localization (ECDL) around the latency, it followed that sources during fuzzy calculation lie in the right hemisphere and that sources during crisp calculation lie in the left hemisphere. In type B, no significant difference was observed.

Event-Related Potentials and Recognition Memory for Low- and High-Frequency Words

1992 ◽  
Vol 4 (1) ◽  
pp. 69-79 ◽  
Author(s):  
Michael D. Rugg ◽  
Michael C. Doyle
Keyword(s):  
Recognition Memory ◽  
High Frequency ◽  
Right Hemisphere ◽  
Recognition Performance ◽  
Low Frequency ◽  
Event Related Potentials ◽  
Process Models ◽  
New Words ◽  
Related Potentials ◽  
The Right

Event-related potentials (ERPs) were recorded while subjects made recognition judgments on high- and low-frequency words, half of which had previously been presented in an incidental study task. Compared to high-frequency items, low-frequency words were associated with superior recognition performance, and attracted a higher proportion of confident judgments. In the case of the low-frequency words only, the region of the ERPs post-500 msec evoked by correctly classified, previously studied (old) words was more positive-going than was the same region of the EWs to nonstudied (new) words. These “old/new” ERP differences were larger from electrodes over the left than over the right hemisphere. This old/new by frequency interaction held when EWs were formed only from words that attracted confident judgments. It is argued that these data are consistent with the ideas that (1) post-500 msec “old/ new” EW differences in recognition memory tasks reflect differences in old and new words' levels of relative familiarity, and (2) the recognition memory advantage for low-frequency words results, at least in part, from the higher level of relative familiarity engendered at test by previously studied low-frequency items. The data are interpreted as providing support for “two-process” models of recognition memory.

Neural Correlates of Empathy for Physical and Psychological Pain

2019 ◽  
Vol 33 (1) ◽  
pp. 54-63 ◽  
Author(s):  
Vera Flasbeck ◽  
Martin Brüne
Keyword(s):  
Right Hemisphere ◽  
Event Related Potentials ◽  
Neural Correlates ◽  
Two Dimensions ◽  
Late Response ◽  
Psychological Pain ◽  
Person Perspective ◽  
Significant Difference ◽  
Related Potentials ◽  
The Right

Abstract. Empathy is known as the ability to share and understand someone else’s feelings. Previous research has either addressed the neural correlates of empathy for pain or social exclusion, but no study has examined empathy for physical and psychological (social) pain simultaneously. Forty-seven participants completed our novel “Social Interaction Empathy Task” during electroencephalogram (EEG) recording. Participants had to observe and rate the intensity of physical and psychological pain in social interactions from a first- and third-person perspective. At the behavioral level, subjects did not differentiate between the perspectives and rated physically painful scenarios as more painful than psychologically painful and neutral interactions. Psychologically painful pictures were also rated as more painful than neutral pictures. Analysis of event-related potentials (ERPs) revealed an early and a late response with a higher ERP response to physical and psychological pain compared to neutral interactions. Moreover, a significant difference emerged between the two dimensions of painful interactions. Furthermore, we found that the activity over frontal regions for discrimination of painful interactions was lateralized to the right hemisphere. Moreover, we detected significant correlations with the self-rated perspective taking ability. This suggests the psychological and physical pain qualities are processed differently but both are related to empathic traits. We further suggest that the right hemisphere may be specifically involved in the processing of empathy-related tasks.

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