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It has been claimed that magnocellular activity can be assessed by measuring the second harmonic responses in visually evoked potentials (VEPs) to On/Off flickering stimuli. The empirical support for this claim is examined. It is noted that: (1) there is in some instances a failure to differentiate counterphase flicker from On/Off flicker. (2) The suggestion that magnocellular activity can be assessed...
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