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

Abstract

This experiment was undertaken to investigate the effects of different types and velocities of apparent motion on the Visual Evoked Potential (VEP). Central (C_z) recording site VEPs were obtained from four males and three females under seven conditions. Significant differences in terms of amplitude and latencies were found between continuous and discrete apparent motion at the O_z 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 C_z. In addition, 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.