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1.

001-es BibID:BIBFORM057766
Első szerző:Czigler István
Cím:Refractory issue and visual mismatch negativity : a skeleton in the cupboard / István Czigler, István Sulykos, Krisztina Kecskés-Kovács
Dátum:2014
ISSN:0167-8760
Megjegyzések:Mismatch negativity (MMN; auditory and visual) is considered as a brain electric/magnetic index of events deviating from regular ones within sequences of events. The underlying process is automatic (does not require attentional processes). MMN is supposed to be an ♭error signal' elicited by the difference between expected and unexpected events. Emergence of the error signal is a consequence of the comparison between the memory representations of the standard and deviant events. However, event-related potential (ERP) difference between deviant and the standard can be attributed to effect of refractoriness/habituation/stimulus specific adaptation (SSA) of the standard-related ERP. A method for separating memory-related mismatch processes and the SSA-related ERP difference is the equal probability control (ERP difference between deviant-related events and events with equally low probability from sequences without high-probability events). In the visual modality this method provided equivocal results. In some studies the deviant minus control difference was similar to the deviant minus standard difference, in other studies only the earlier part of the negativity was abolished, and in our recent experiment orientation-related visual MMN was fully abolished by the equal probability control (and also by the related cascade control). At the same time, results of a considerable number of studies cannot be explained as refractoriness effect. Interestingly, whereas in the field of (auditory and visual) MMNSSA is considered as a ♭trivial' physiological effect, in other fields of neuroimaging SSA is considered as the most valid index of memory acquisition. Furthermore, in a related paradigm, an adaptor (sometimes a longer stimulus) is followed by a test stimulus. Test stimuli identical (or related) to the adaptor elicit smaller ERP activity than a different test stimuli. In our recent study orientation differences were investigated both in mismatch and adaptation paradigms. Visual MMN and the adaptation-related difference were fairly similar, showing related underlying processes. On the basis of such set of results we propose a sequence of processes. (1)SSE-related deviant-standard difference is related to the acquisition of memory-specific processes. Being an effect on the standard, this effect is missing in the equal probability condition. Memory acquisition does not necessarily require repeated presentation (like in oddball sequences). (2)A consequence of mismatch process (error signal) is indicated by the part of deviant minus standard ERP difference which is insensitive to the equal probability control. This effect is connected to the deviant stimuli.
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok idézhető absztrakt
mismatch negativity
refractoriness effect
Megjelenés:International Journal Of Psychophysiology. - 94 : 2 (2014), p. 155-. -
További szerzők:Sulykos István Kecskés-Kovács Krisztina (1984-) (pszichológus)
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2.

001-es BibID:BIBFORM057660
Első szerző:Czigler István
Cím:Asymmetry of automatic change detection shown by the visual mismatch negativity : an additional feature is identified faster than missing features / István Czigler, István Sulykos, Krisztina Kecskés-Kovács
Dátum:2014
ISSN:1530-7026 1531-135X
Megjegyzések:In two experiments, we demonstrated that anasymmetric effect of the brain electric activity that is elicitedby nonattended visual stimuli is similar to the one found inresponses observed in the performance of visual searchtasks. The automatic detection of violated sequential regularitieswas investigated by measuring the visual mismatchnegativity (vMMN) component of event-related brain potentials(ERPs). In Experiment 1, within a sequence of stimulusdisplays with O characters, infrequently presented Q characterselicited an earlier vMMN than did infrequent O characterswithin a sequence of Q characters. In Experiment 2,similar asymmetric results emerged if only 16 % of thecharacters were different within an infrequent display. Inboth experiments, these stimuli were irrelevant; during thestimulus sequences, participants performed a demandingvideogame. We suggest that the underlying match/mismatchand decision processes are similar in the vMMN and in theattention-related visual search paradigm, at least in the caseof the stimuli in the present experiments.
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Change detection
Visual perception
Visual mismatch negativity
Search asymmetry
Megjelenés:Cognitive, Affective, & Behavioral Neuroscience. - 14 : 1 (2014), p. 278-285. -
További szerzők:Sulykos István Kecskés-Kovács Krisztina (1984-) (pszichológus)
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3.

001-es BibID:BIBFORM057763
Első szerző:Kecskés-Kovács Krisztina (pszichológus)
Cím:The female is a real oddball between males: a vmmn study to automatic gender face category changing / Krisztina Kecskés-Kovács, István Sulykos, István Czigler
Dátum:2013
ISSN:0048-5772
Megjegyzések:The visual mismatch negativity (vMMN) event- related potential (ERP) is a counterpart of the auditory mismatch negativity. VMMN is elicited by violation of sequential regularity established by environmental stimulation. In the present study we investigated the sensitivity of vMMN to the violation of meaningful category: the human gender faces. The ERPs were recorded to emotionally neutral cropped female and male faces with 300 ms stimulus duration. The stimuli were delivered in passive oddball paradigm (the vMMN-related stimuli were independent of the visual detection task). In Experiment 1 the stimuli were presented with 400 ms inter-stimulus-interval (ISI) and in Experiment 2 with 2250 ms ISI. There was no repetition along the experimental blocks regarding the physical appearance of the stimuli. In both experiments the electrophysiological data showed that, the infrequent faces elicited a parieto-occipital negativity with 350 ms peak latency, relative to the frequent faces. These components are considered as a genuine vMMN that is generated by automatic detection of gender category change. Additionally, the N1/N170 face- related component was sensitive to ISI effect i.e. using longer ISI, the face stimuli elicited pronounced N1/N170 component. In conclusion, the present result showed that the gender face category can be represented without the involvement of the attentional processes.
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok idézhető absztrakt
visual mismatch negativity
gender faces
Megjelenés:Psychophysiology. - 50 : 1 (2013), p. 25. -
További szerzők:Sulykos István Czigler István (1946-)
Pályázati támogatás:OTKA-104462
OTKA
Internet cím:DOI
Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:BIBFORM057658
Első szerző:Kecskés-Kovács Krisztina (pszichológus)
Cím:Is it a face of a woman or a man? Visual mismatch negativity is sensitive to gender category / Krisztina Kecskés-Kovács, István Sulykos, István Czigler
Dátum:2013
ISSN:1662-5161
Megjegyzések:The present study investigated whether gender information for human faces was represented by the predictive mechanism indexed by the visual mismatch negativity (vMMN) event ? related brain potential (ERP). While participants performed a continuous size-change-detection task, random sequences of cropped faces were presented in the background, in an oddball setting: either various female faces were presented infrequently among various male faces, or vice versa. In Experiment 1 the inter-stimulus- interval (ISI) was 400 ms, while in Experiment 2 the ISI was 2250 ms. The ISI difference had only a small effect on the P1 component, however the subsequent negativity (N1/N170) was larger and more widely distributed at longer ISI, showing different aspects of stimulus processing.As deviant -minus- standard ERP difference, a parieto ? occipital negativity (vMMN) emerged in the 200 ? 500 ms latency range (~ 350 ms peak latency in both experiments). We argue that regularity of gender on the photographs is automatically registered, and the violation of the gender category is reflected by the vMMN. In conclusion the results can be interpreted as evidence for the automatic activity of a predictive brain mechanism, in case of an ecologically valid category.
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
event-relatedpotential (ERP)
gender
perceptual categorization
automatic change detection
facial processing
visual mismatch negativity(vMMN)
passive oddball paradigm
Megjelenés:Frontiers in Human Neuroscience. - 7 : 532 (2013), p. 1-11. -
További szerzők:Sulykos István Czigler István (1946-)
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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5.

001-es BibID:BIBFORM057657
Első szerző:Kecskés-Kovács Krisztina (pszichológus)
Cím:Visual mismatch negativity is sensitive to symmetry as a perceptual category / Krisztina Kecskés-Kovács, István Sulykos, István Czigler
Dátum:2013
ISSN:0953-816X
Megjegyzések:We investigated the sensitivity of visual mismatch negativity (vMMN) to an abstract and non-semantic category, vertical mirrorsymmetry. Event-related potentials (ERPs) elicited by random and symmetric square patterns, delivered in passive oddball paradigm(participants played a video game), were recorded. In one of the conditions, symmetric patterns were frequent (standard)stimuli and the random patterns were infrequent (deviant) stimuli; in the other condition, the probabilities were reversed. We comparedthe ERPs elicited by symmetric stimuli as deviants and as standards, and, similarly, the ERPs elicited by the random deviantsand random standards. As the difference between the ERPs elicited by random deviant and random standard stimuli, aposterior negativity emerged in two latency ranges (112?120 and 284?292 ms). These negativities were considered to be vMMNcomponents. We suggest that the two vMMN components are organised in cascade error signals. However, there was no significantdifference between the ERPs elicited by symmetric deviants and those elicited by symmetric standards. The emergence ofvMMN in response to the deviant random stimuli is considered to be a deviation of a perceptual category (in the symmetric standardsequence presented). Accordingly, random stimuli acquired no perceptual category; for this reason, the symmetric deviant(in the random standard sequence presented) elicited no vMMN. The results show that the memory system underlying vMMN iscapable of coding perceptual categories such as bilateral symmetry, even if the stimulus patterns are unrelated to the ongoingbehavior.
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
cognitive
event-related potentials
neuroscience
perception
visual attention
Megjelenés:European Journal of Neuroscience. - 37 : 4 (2013), p. 662-667. -
További szerzők:Sulykos István Czigler István (1946-)
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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6.

001-es BibID:BIBFORM057767
Első szerző:Sulykos István
Cím:Asymmetric effect of automatic deviant detection : the effect of familiarity in visual mismatch negativity / István Sulykos, Krisztina Kecskés-Kovács, István Czigler
Dátum:2015
ISSN:0006-8993
Megjegyzések:The visual mismatch negativity (vMMN) component is regarded as a prediction error signal elicited by events violating the sequential regularities of environmental stimulation. The aim of the study was to investigate the effect of familiarity on the vMMN. Stimuli were patterns comprised of familiar (N) or unfamiliar (I) letters. In a passive oddball paradigm, letters (N and I) were presented as either standard or deviant in separate conditions. VMMNs emerged in both conditions; peak latency of vMMN was shorter to the I deviant compared to the vMMN elicited by the N deviant. To test the orientation-specific effect of the oblique lines on the vMMN, we introduced a control experiment. In the control experiment, the patterns were constructed solely from oblique lines, identical to the oblique lines of the N and I stimuli. Contrary to the first experiment, there was no significant difference between the vMNNs elicited by the two orientations. Therefore, the differences in vMMNs to I and N deviants are not attributable to the physical difference between the I and N stimuli. Consequently, the vMMN is sensitive to the familiarity of the stimuli.
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
visual change-detection
visual mismatch negativity
visual search
search asymmetry
familiarity
Megjelenés:Brain Research. - 1626 (2015), p. 108-117. -
További szerzők:Kecskés-Kovács Krisztina (1984-) (pszichológus) Czigler István (1946-)
Pályázati támogatás:OTKA-104462
OTKA
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
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7.

001-es BibID:BIBFORM057764
Első szerző:Sulykos István
Cím:Mismatch negativity does not show evidence of memory reactivation in the visual modality / István Sulykos, Krisztina Kecskés-Kovács, István Czigler
Dátum:2013
ISSN:0269-8803
Megjegyzések:The possibility of reactivation of the memory representation underlying visual mismatch negativity (vMMN) was investigated in a modified passive roving-standard paradigm. Stimuli (arrays of Ga?bor patches) were presented in sequences with blank interval between the sequences. The first member of each sequence was identical to the standard of the previous sequence, while the second stimulus had differentorientation therefore the second stimulus was considered as deviant. In a control condition the stimuli of the previous sequence had randomorientations. Event-related potentials (ERPs) in response to the deviants were compared to ERPs in response to the (physically identical) secondstimulus of the control sequences. The comparison showed emergence of a positive component at an early (98?132 ms) latency range elicited by deviants. This component is interpreted as an index of increased sensitivity to rare changes in sequences dominated by identical stimuli rather than a component specific to violation of sequential regularity. Consequently, contrary to the findings in the auditory modality, the first stimulus of the sequence did not reactivate the memory representation underlying the vMMN, since subsequent deviant elicited no vMMN.
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
visual mismatch negativity
change positivity
reactivation
roving-standard paradigm
Megjelenés:Journal Of Psychophysiology. - 27 : 1 (2013), p. 1-7. -
További szerzők:Kecskés-Kovács Krisztina (1984-) (pszichológus) Czigler István (1946-)
Pályázati támogatás:OTKA-71600
OTKA
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DOI
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8.

001-es BibID:BIBFORM069126
Első szerző:Takács Endre
Cím:Oblique effect in visual mismatch negativity / Endre Takács, István Sulykos, István Czigler, Irén Barkaszi, László Balázs
Dátum:2013
ISSN:1662-5161
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
visual mismatch negativity (vMMN)
event-related potential (ERP)
unconscious processing
attention
oblique effect
oddball paradigm
Megjelenés:Frontiers in Human Neuroscience. - 7 (2013), p. 1-13. -
További szerzők:Sulykos István Czigler István (1946-) Barkaszi Irén (1978-) (pszichológia) Balázs László (pszichológia)
Pályázati támogatás:OTKA-104462
OTKA
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DOI
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9.

001-es BibID:BIBFORM057765
Első szerző:Török Ágoston
Cím:Comparison between wireless and wired EEG recordings in a virtual reality lab: case report / Ágoston Török, István Sulykos, Krisztina Kecskés-Kovács, György Persa, Péter Galambos, Andrea Kóbor, István Czigler, Valéria Csépe, Péter Baranyi, Ferenc Honbolygó
Dátum:2014
Megjegyzések:Wireless EEG is a promising tool that can bring neuroscience research closer to the study of perception and cognition in realistic scenarios. Perhaps the most interesting approach is to combine wireless EEG and virtual reality, where one can create and manipulate realistic multimodal environments. However EEG recording during locomotion in a virtual reality lab is exposed to several types of electrical noise generating hardware. In the current paper we present two studies. In the first we turned on and off possible sources of electrical noise. We found that although electrical noise is present in the data, it is typically localized above the frequency ranges of brain related activity. In the second study we measured event related potential changes to a simple visual stimulus using wireless and wired setup in a virtual reality room and in a psychophysiology lab. We found that the shape of the N1, an early component of visual processing is not affected by the type of signal transmission but importantly its latency is different in the two labs.
Tárgyszavak:Bölcsészettudományok Pszichológiai tudományok konferenciacikk
wireless EEG
Virtual reality
CAVE
N1 component
ERP
Megjelenés:Cognitive Infocommunications (CogInfoCom). - 1 : 1 (2014), p. 599-603.
További szerzők:Sulykos István Kecskés-Kovács Krisztina (1984-) (pszichológus) Persa György Galambos Péter Kóbor Andrea Czigler István (1946-) Csépe Valéria Baranyi Péter Honbolygó Ferenc
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