Summary
Human averaged visual evoked potentials (VEPs) have been recorded to the onset, reversal and offset of motion of a visual noise pattern as in the previous paper; and to the appearance and disappearance of stationary and of moving noise patterns. These VEPs have been compared.
The VEPs to motion-reversal and -offset and pattern-appearance were very similar in waveform and scalp-distribution, and in inter-subject variation; and all three components of each of these VEPs reversed polarity between upper and lower half-field stimulation.
Motion-onset and pattern-disappearance VEPs were similar to each other but very different from the former group of VEPs; and they did not clearly exhibit polarity reversal between the upper and lower half-fields.
The pattern-appearance and -disappearance VEPs were largest for stationary patterns, and all components were steadily reduced as the stimulus velocity was increased.
Previous research implies that the motion-reversal VEPs are genuine responses to changes in the motion as such. From the data presented in this and the previous paper it is concluded that the motion-offset and -onset VEPs likewise may be largely the product of motion-sensitive mechanisms when the stimulus velocity is less than about 10dg/sec.
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Clarke, P.G.H. Comparison of visual evoked potentials to stationary and to moving patterns. Exp Brain Res 18, 156–164 (1973). https://doi.org/10.1007/BF00234720
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DOI: https://doi.org/10.1007/BF00234720