Visual mismatch negativity as a non-attentional reaction to change in repetition pattern

Mismatch negativity (MMN) is an event related potential generated by brain’s electric activation as an automatic response to change in repetitive stimulation. Two scenarios of an oddball experiment were performed among 9 students of University of Silesia at the age of 20–25 years, with the use of standard, deviant and distractor events. Difference deviant-standard waveforms were obtained, which presented posterior negativity in the range 140–200 ms after stimulus onset. Subtraction of the standard from deviant ERP waveforms, irrelevance to participant’s task, and independence from stimulus physical parameters imply that the posterior negativity evoked in this study seems to be a visual mismatch negativity as a result of pre-attentive central visual processing.