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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-)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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