Visual temporal window of integration as revealed by the visual mismatch negativity event-related potential to stimulus omissions

2006 ◽  
Vol 1104 (1) ◽  
pp. 129-140 ◽  
Author(s):  
István Czigler ◽  
István Winkler ◽  
Lívia Pató ◽  
Anna Várnagy ◽  
Júlia Weisz ◽  
...  
Keyword(s):  
Mismatch Negativity ◽  
Event Related Potential ◽  
Temporal Window ◽  
Visual Mismatch Negativity

scholarly journals sLORETA Source Localisation of Visual Mismatch Negativity in Dyslexic Children During Malay Orthographical Lexicon Stimulations

2020 ◽  
Vol 27 (5) ◽  
pp. 36-42
Author(s):  
Siti Atiyah Ali ◽  
Tahamina Begum ◽  
Faruque Reza ◽  
Nor Asyikin Fadzil ◽  
Faiz Mustafar
Keyword(s):  
Decision Making ◽  
Frontal Lobe ◽  
Mismatch Negativity ◽  
Lexical Processing ◽  
Occipital Lobe ◽  
Event Related Potential ◽  
Electromagnetic Tomography ◽  
Source Localisation ◽  
Visual Mismatch Negativity ◽  
Grand Average

Background: While there are studies on visual lexical processing in other languages among dyslexics, no studies were done in the Malay language. The origin of visual lexical processing might be different in the Malay language. We aimed to detect the source localisation of visual mismatch negativity (vMMN) during Malay orthographic lexicon stimulations, employing an event-related potential (ERP) study. Methods: Twelve dyslexic and twelve non-dyslexic children participated in this study. They pushed button ‘1’ when they saw real (meaningful) Malay words and button ‘2’ for pseudowords (meaningless). The source localisation of vMMN was performed in the grand average waveform by applying the standardised low-resolution brain electromagnetic tomography (sLORETA) method using Net Station software. Results: Left occipital (BA17) and left temporal (BA37) lobes were activated during real words in the non-dyslexic and dyslexic children, respectively. During pseudowords, BA18 and BA17 areas of the left occipital lobe were activated in the non-dyslexic and dyslexic children, separately. vMMN sources were found at the left temporal (BA37) and right frontal (BA11) lobes in nondyslexic and dyslexic children, respectively. Conclusion: Right frontal lobe is the decision-making area where vMMN source was found in dyslexic children. We concluded that dyslexic children required the decision-making area to detect Malay real and pseudowords.

Automatic Change Detection in Older and Younger Women: A Visual Mismatch Negativity Study

Gerontology ◽  
2018 ◽  
Vol 64 (4) ◽  
pp. 318-325 ◽  
Author(s):  
István Sulykos ◽  
Zsófia Anna Gaál ◽  
István  Czigler
Keyword(s):  
Visual Processing ◽  
Mismatch Negativity ◽  
Stimulus Change ◽  
Age Groups ◽  
The Elderly ◽  
Event Related Potential ◽  
Visual Mismatch Negativity ◽  
Age Related ◽  
Latency Range ◽  
Age Related Changes

Background: In comparison to controlled (attentional) processing, relatively little is known about the age-related changes of the earlier (preattentive) processes. An event-related potential (ERP) index of preattentive (automatic) visual processing, the visual mismatch negativity (vMMN) is a good candidate for analyzing age-related differences in the automatic processing of visual events. Objective: So far results concerning age-related changes in vMMN have been equivocal. Our aim was to develop a method resulting in a reliable vMMN in a paradigm short enough to use in the applied field. Methods: We investigated an older (mean age: 66.4 years, n = 15) and a younger (mean age: 22.4 years, n = 15) group of healthy women. ERPs were obtained for checkerboard onset patterns in a passive oddball condition (during which participants performed a tracking task). One of the checkerboards was frequent (standard; p = 0.8), and the other was rare (deviant; p = 0.2). Results: vMMN emerged over posterior locations in the latency range of 100–300 ms in both age groups. The amplitude of the earlier part of the vMMN was similar in the older and the younger participants, but latency was longer in the older group. The later part of the vMMN was slightly diminished in the elderly. Conclusion: Automatic detection of violated sequential regularities, reflected by the vMMN, emerged in the two age groups (earlier vMMN). However, detection of stimulus change, a preattentive visual process delayed in the elderly, and identification of the specific change was compromised in the older participants.

scholarly journals Prediction errors in surface segmentation are reflected in the visual mismatch negativity, independently of task and surface features

2019 ◽  
Author(s):  
Matt Oxner ◽  
Eric T. Rosentreter ◽  
William Hayward ◽  
Paul Michael Corballis
Keyword(s):  
Mismatch Negativity ◽  
Prediction Error ◽  
Event Related Potential ◽  
Prediction Errors ◽  
Visual Mismatch Negativity ◽  
Surface Layout ◽  
Surface Segmentation ◽  
Electrophysiological Signals ◽  
Task Irrelevant ◽  
Visual Domain

The visual system quickly registers perceptual regularities in the environment and responds to violations in these patterns. Errors of perceptual prediction are associated with electrocortical modulation, including the visual mismatch negativity (vMMN) and P2 event-related potential. One relatively unexplored question is whether these prediction error signals can encode higher-level properties such as surface segmentation, or whether they are limited to lower-level perceptual features. Using a roving standard paradigm, a triangle surface appeared either behind (featuring amodal contours) or in front of (featuring real contours) a second surface with hole-like windows. A surface layout appeared for 2-5 repetitions before switching to the other "deviant" layout; lighting and orientation of stimuli varied across presentations while remaining isoluminant. Observers responded when they detected a rare "pinched" triangle which occasionally appeared. Cortical activity - reflected in mismatch responses affecting the P2-N2 and P300 amplitudes - was sensitive to a change in stimulus layout, when surfaces shifted position in depth, following several repetitions. Specifically, layout deviants led to a more negative P2-N2 complex at posterior electrodes, and greater P300 positivity at central sites. Independently of these signals of a deviant surface layout, further modulations of the P2 encoded differences between layouts and detection of the rare target stimulus. Comparison of the effect of preceding layout repetitions on this prediction error signal suggests that it is all-or-none and not graded with respect to the number of previous repetitions. We show that within the visual domain, unnoticed and task-irrelevant changes in visual surface segmentation leads to observable electrophysiological signals of prediction error that are dissociable from stimulus-specific encoding and lower-level perceptual processing.

An Electrophysiological Measure of Temporal Resolution in Normal Subjects Using Frequency Modulated Signals

2002 ◽  
Vol 11 (1) ◽  
pp. 42-49
Author(s):  
Devin L. McCaslin ◽  
Lawrence L. Feth ◽  
Gary P. Jacobson ◽  
Pamela J. Mishler
Keyword(s):  
Temporal Resolution ◽  
Mismatch Negativity ◽  
Normal Subjects ◽  
Single Step ◽  
Event Related Potential ◽  
Frequency Range ◽  
Temporal Properties ◽  
Step Duration ◽  
The Mean ◽  
Modulated Signals

This investigation was conducted to determine whether an exogenous event-related potential called the mismatch negativity (MMN) would change systematically in response to frequency-modulated signals with varying temporal properties. Both N1 and P2 waveforms were recorded for 50-ms frequency-modulated signals from normal hearing listeners. The standard stimuli for this investigation were continuous sweep tones with center frequencies of 1000 Hz that traversed a frequency range of 200 Hz in a single step. The rare stimuli were signals that traversed the same frequency range in two, four, six, or eight discrete steps. Results suggest that for the 10 participants, 1) the mean MMN peak-to-peak amplitude and mean area decreased significantly with decreases in step duration, 2) MMN area amplitude was the best indicator of psychophysical performance for the two magnitude measures, and 3) MMN onsets and peak latencies did not show either a significant increase or decrease in latency as step duration decreased.

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