Evaluating the event-related potentials relevant to two groups of the Quran memorizers and non-memorizers during the retrieval phase of the visual memory

2022 ◽  
Vol 73 ◽  
pp. 103411
Author(s):  
Hadi Akbari ◽  
Ali Sheikhani ◽  
Ali Motie NasrAbadi ◽  
Mohammad Reza Mohammadi ◽  
Majid Ghoshuni
Keyword(s):  
Visual Memory ◽  
Event Related Potentials ◽  
Related Potentials ◽  
Retrieval Phase

scholarly journals Brain Processing of Complex Geometric Forms in a Visual Memory Task Increases P2 Amplitude

2020 ◽  
Vol 10 (2) ◽  
pp. 114
Author(s):  
Héctor A. Cepeda-Freyre ◽  
Gregorio Garcia-Aguilar ◽  
Jose R. Eguibar ◽  
Carmen Cortes
Keyword(s):  
Working Memory ◽  
Visual Working Memory ◽  
Cognitive Processing ◽  
Visual Memory ◽  
Memory Load ◽  
Memory Task ◽  
Event Related Potentials ◽  
Brain Regions ◽  
Test Phase ◽  
Related Potentials

We study the cognitive processing of visual working memory in three different conditions of memory load and configuration change. Altering this features has been shown to alter the brain’s processing in memory tasks. Most studies dealing with this issue have used the verbal-phonological modality. We use complex geometric polygons to assess visual working memory in a modified change detection task. Three different types of backgrounds were used to manipulate memory loading and 18 complex geometric polygons to manipulate stimuli configuration. The goal of our study was to test whether the memory load and configuration affect the correct-recall ratios. We expected that increasing visual items loading and changing configuration of items would induce differences in working memory performance. Brain activity related to the task was assessed through event-related potentials (ERP), during the test phase of each trial. Our results showed that visual items loading and changing of item configuration affect working memory on test phase on ERP component P2, but does not affect performance. However frontal related ERP component—P3—was minimally affected by visual memory loading or configuration changing, supporting that working memory is related to a filtering processing in posterior brain regions.

Time–frequency distribution properties of event-related potentials in mental fatigue induced by visual memory tasks

Neuroreport ◽  
2016 ◽  
Vol 27 (14) ◽  
pp. 1031-1036 ◽  
Author(s):  
Xinyang Liu ◽  
Juntao Liu ◽  
Shuping Gai ◽  
Kristina Meyer ◽  
Shengwei Xu ◽  
...  
Keyword(s):  
Frequency Distribution ◽  
Visual Memory ◽  
Event Related Potentials ◽  
Mental Fatigue ◽  
Time Frequency ◽  
Related Potentials ◽  
Time Frequency Distribution

scholarly journals Differential Generation of Saccade, Fixation, and Image-Onset Event-Related Potentials in the Human Mesial Temporal Lobe

2020 ◽  
Vol 30 (10) ◽  
pp. 5502-5516
Author(s):  
Chaim N Katz ◽  
Kramay Patel ◽  
Omid Talakoub ◽  
David Groppe ◽  
Kari Hoffman ◽  
...  
Keyword(s):  
Eye Movements ◽  
Temporal Lobe ◽  
Visual Information ◽  
Visual Memory ◽  
Visual Stimulation ◽  
Low Frequency ◽  
Event Related Potentials ◽  
Saccade Onset ◽  
Related Potentials ◽  
Mesial Temporal Lobe

Abstract Event-related potentials (ERPs) are a commonly used electrophysiological signature for studying mesial temporal lobe (MTL) function during visual memory tasks. The ERPs associated with the onset of visual stimuli (image-onset) and eye movements (saccades and fixations) provide insights into the mechanisms of their generation. We hypothesized that since eye movements and image-onset provide MTL structures with salient visual information, perhaps they both engage similar neural mechanisms. To explore this question, we used intracranial electroencephalographic data from the MTLs of 11 patients with medically refractory epilepsy who participated in a visual search task. We characterized the electrophysiological responses of MTL structures to saccades, fixations, and image-onset. We demonstrated that the image-onset response is an evoked/additive response with a low-frequency power increase. In contrast, ERPs following eye movements appeared to arise from phase resetting of higher frequencies than the image-onset ERP. Intriguingly, this reset was associated with saccade onset and not termination (fixation), suggesting it is likely the MTL response to a corollary discharge, rather than a response to visual stimulation. We discuss the distinct mechanistic underpinnings of these responses which shed light on the underlying neural circuitry involved in visual memory processing.

scholarly journals Differential generation of saccade, fixation and image onset event-related potentials in the human mesial temporal lobe

2018 ◽  
Author(s):  
Chaim N. Katz ◽  
Kramay Patel ◽  
Omid Talakoub ◽  
David Groppe ◽  
Kari Hoffman ◽  
...  
Keyword(s):  
Eye Movements ◽  
Temporal Lobe ◽  
Visual Information ◽  
Visual Memory ◽  
Visual Stimulation ◽  
Event Related Potentials ◽  
Saccade Onset ◽  
Related Potentials ◽  
Mesial Temporal Lobe ◽  
Onset Response

The electrophysiological signatures of encoding and retrieval recorded from mesial temporal lobe (MTL) structures are observed as event related potentials (ERPs) during visual memory tasks. The waveforms of the ERPs associated with the onset of visual stimuli (image-onset) and eye movements (saccades and fixations) provide insights into the mechanisms of their generation. We hypothesized that since eye movements and image-onset (common methods of stimulus presentation when testing memory) provide MTL structures with salient visual information, that perhaps they both engage similar neural mechanisms. To explore this question, we used intracranial electroencephalographic (iEEG) data from the MTLs of 11 patients with medically refractory epilepsy who participated in a visual search task. We sought to characterize electrophysiological responses of MTL structures to saccades, fixations and image onset. We demonstrate that the image-onset response is an evoked/additive response with a low-frequency power increase and post-stimulus phase clustering. In contrast, ERPs following eye movements appeared to arise from phase resetting of higher frequencies than the image onset ERP. Intriguingly, this reset was associated with saccade onset and not saccade termination (fixation), suggesting it is likely the MTL response to a corollary discharge, rather than a response to visual stimulation - in stark contrast to the image onset response. The distinct mechanistic underpinnings of these two ERP may help guide future development of visual memory tasks.

Multiple Levels of Stimulus Representation in Visual Working Memory

2006 ◽  
Vol 18 (5) ◽  
pp. 844-858 ◽  
Author(s):  
Eunsam Shin ◽  
Monica Fabiani ◽  
Gabriele Gratton
Keyword(s):  
Working Memory ◽  
Visual Working Memory ◽  
Visual Memory ◽  
Memory Search ◽  
Event Related Potentials ◽  
Neural Representation ◽  
Set Size ◽  
Related Potentials ◽  
Multiple Levels ◽  
Letter Case

Object recognition presumably involves activation of multiple levels of representation. Here we use the encoding-related lateralization (ERL) method [Gratton, G. The contralateral organization of visual memory: A theoretical concept and a research tool. Psychophysiology, 35, 638–647, 1998] to describe the sequential activation of several of these levels. The ERL uses divided-field encoding to generate contralaterally biased representations in the brain. The presence and nature of these representations can be demonstrated by examining the event-related potentials (ERPs) elicited by centrally presented test probes for lateralized activity corresponding to the encoding side. We recorded ERPs during a memory-search task. Memory sets were composed of two or four uppercase letters displayed half to the left and half to the right of fixation. Probe stimuli were composed of one letter presented foveally in either upper- or lowercase. Letter case was manipulated to differentiate the time course of physical and symbolic levels of letter representation. Memory set size was manipulated to examine a relational level of letter representation. We found multiple ERLs in response to the probes: (1) An early (peak = 170 msec) case-dependent (but set size independent) ERL, most evident at P7/P8, indexing the availability of a physical level of letter representation; (2) a later (200–400 msec) more diffusedly distributed ERL, independent of both letter case and set size, indexing a symbolic level of letter representation; (3) a long-latency (400–600 msec) ERL occurring at posterior sites, larger for the case match, Set Size 2 condition, indexing competition for neural representation across multiple letters. By assuming that these ERL activities track the progression of letter representation over time, we propose a model of letter processing in the context of visual working memory.

Cognitive brain potentials and psychological deficits in Alzheimer's dementia and Korsakoff's amnesic syndrome

1987 ◽  
Vol 17 (2) ◽  
pp. 349-358 ◽  
Author(s):  
D. H. R. Blackwood ◽  
D. M. St Clair ◽  
I. M. Blackburn ◽  
G. M. B. Tyrer
Keyword(s):  
Visual Memory ◽  
Event Related Potentials ◽  
Significant Negative Correlation ◽  
P300 Amplitude ◽  
P300 Latency ◽  
Neuropsychological Measures ◽  
Amnesic Syndrome ◽  
Related Potentials ◽  
Normal Ageing ◽  
Complex Relationships

SynopsisAuditory-event-related potentials, including the P300 response, were recorded from 20 patients with Aizeheimer-type dementia (ATD), 17 patients with Korsakoff's syndrome (KS) and 23 age-matched control subjects. Each of the subjects was assessed using a version of the Luria Neuropsychological Investigation. Prolonged P300 latency and reduced P300 amplitude, which are features of normal ageing and which also occur, to a greater degree, in ATD, correlated significantly with degree of impairment of language ability in both Alzheimer patients and controls. On the other hand, the association between P300 latency changes and various tests of memory was not consistent across the three subject groups; there was a significant negative correlation between P300 latency and visual memory in ATD and a significant positive correlation in KS, whereas in controls no significant correlation was found. By contrast, P300 latency and memory for words were significantly negatively correlated in controls, but in neither of the patient groups.Detailed studies of language function may further elucidate the complex relationships between neuropsychological measures and P300 changes in normal ageing and dementia.

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