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Backward masking and visual mismatch negativity: Electrophysiological evidence for memory‐based detection of deviant stimuli
Author(s) -
Czigler István,
Weisz Júlia,
Winkler István
Publication year - 2007
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.2007.00530.x
Subject(s) - mismatch negativity , psychology , audiology , stimulus (psychology) , electroencephalography , checkerboard , electrophysiology , event related potential , negativity effect , developmental psychology , visual masking , backward masking , sensory memory , cognitive psychology , visual perception , neuroscience , perception , medicine , geometry , mathematics
Sequences composed of two different colored checkerboard patterns (standard and deviant) were presented to adults. Each pattern was followed by a mask with stimulus onset asynchronies (SOAs) varying between 14 and 174 ms. ERPs were recorded to the deviant and standard stimuli while the participants detected changes of a cross, which was continuously present at the center of the screen. In further experiments, the participants performed a Go‐NoGo task detecting the deviant checkerboards. Deviant stimuli elicited an occipital negative component with 124–132 ms mean latency (the visual mismatch negativity, vMMN) at test (standard or deviant)‐to‐mask SOAs longer than 27 ms. No vMMN amplitude increase was observed beyond 40 ms test‐to‐mask intervals, whereas detection of deviant checkerboard patterns improved up to 174‐ms SOA. Therefore the processes underlying vMMN elicitation cannot fully explain the overt detection of visual deviance.