Abstract: ObjectiveTo investigate if there were potential components similar to auditory mismatch negativity (MMN) in the visual modality.MethodsEvent-related potentials (ERP) of 15 healthy adults were tested. Subjects were demanded to complete shape-matching task and double-matching task under 4 kinds visual stimuli including no-difference (Nd), contour-difference (Cd), shape-difference (Sd) and double-difference (Dd).ResultsWithin P1-N1 latent period (100～140 ms), three kinds of deviant stimuli (Cd, Sd, Dd) elicited a positivity, mismatch positivity (MMP). MMP amplitude elicited by Dd was a sum elicited by Cd and Sd (single-difference).ConclusionIn the visual modality, MMP elicited by warp stimulus may be an element similar to auditory MMN and reflect auto-processing of brain to visual stimulus.

Key words: event-related potentials, visual modality, mismatch negativity, mismatch positivity