This research was supported by the National Scientific Foundation of Hungary (OTKA T-047038). We thank for Lívia Pató for her help.
Backward masking and visual mismatch negativity: Electrophysiological evidence for memory-based detection of deviant stimuli
Article first published online: 22 MAY 2007
Volume 44, Issue 4, pages 610–619, July 2007
How to Cite
Czigler, I., Weisz, J. and Winkler, I. (2007), Backward masking and visual mismatch negativity: Electrophysiological evidence for memory-based detection of deviant stimuli. Psychophysiology, 44: 610–619. doi: 10.1111/j.1469-8986.2007.00530.x
- Issue published online: 22 MAY 2007
- Article first published online: 22 MAY 2007
- (Received December 13, 2006; Accepted March 20, 2007)
- Backward masking;
- Visual mismatch negativity;
- Deviance detection;
- Visual memory
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.