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.
ABSTRACT
Objective To investigate the effects of recognition of emotional content words on event-related potentials (ERPs) of patients with major depression. Methods ERPs were recorded in 16 patients with major depression and 18 healthy subjects while they performed a visual Chinese emotional content words recognition task. The study used a word identification task consisting of 20% negative and 20% positive words as well as 60% neutral words. Results The ERPs demonstrated similar waveform (N90,P160,N250,P290,N350,P490,N650) between depression patients and normal group, but its components were different. Amplitudes of many ERPs components in patients group were significantly decreased but N250 were significantly increased in FZ and F4 as compared with those of the normal groups (P