Backward masking and visual mismatch negativity: electrophysiological evidence for memory-based detection of deviant stimuli |
| |
Authors: | Czigler István Weisz Júlia Winkler István |
| |
Institution: | Institute for Psychology of the Hungarian Academy of Sciences, Budapest, Hungary. czigler@cogpsyphy.hu |
| |
Abstract: | 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. |
| |
Keywords: | Backward masking Visual mismatch negativity Deviance detection Visual memory |
本文献已被 PubMed 等数据库收录! |