Visual mismatch negativity elicited by magnocellular system activation.
The processing of visual motion was tested by means of event related potentials recording (ERP) using a paradigm designed to produce a visual mismatch negativity effect. The stimuli were unattended and presented in the peripheral visual field (outside the central 15 degrees). The standard stimulus consisted of an up/down motion sequence, whilst the deviant stimulus of a down/up motion sequence. Significant ERP differences between the standard and deviant conditions were found in 8 out of 10 adult subjects already in 80 ms and prevailingly in interval 145-260 ms from the initial stimulus presentation. The results demonstrate that the magnocellular information undergoes processing capable of detecting differences in the sequence of unattended peripheral motion stimuli.
Kremlácek
J
J
Department of Pathological Physiology, Charles University in Prague, Faculty of Medicine in Hradec Králové, Czech Republic. jan.kremlacek@lfhk.cuni.cz
Kuba
M
M
Kubová
Z
Z
Langrová
J
J
D000328:Adult; D001288:Attention / Q000502:physiology; D004569:Electroencephalography; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009039:Motion Perception / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D014794:Visual Fields / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology*