Visual Evoked Potentials Under Varied Velocities of Continuous and Discrete Apparent Motion

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Abstract
This experiment was undertaken to investigate the effects of different types and velocities of apparent motion on the visual evoked potential (VEP). Central (Cz) recording site VEP were obtained from 4 males and 3 females under 7 conditions. Significant differences in terms of amplitude and latencies were found between continuous and discrete apparent motion at the Oz [occipital location] derivation only. Theoretical and cell system models describing separate cortical channels for processing continuous and discrete apparent motion were presented to account for the observed differences. The stationary condition produced a significantly shorter latency than all other conditions at Cz. Discernable trends observed between central and occipital recording sites suggest the role of the occipital cortex as the primary processor of motion and for detecting differences in motion velocity.