When filters of unequal optical density are placed in front of the two eyes, a target which is actually oscillating in a frontoparallel plane appears nearer than it really is for one direction of stroke and farther than it really is for the return stroke (Pulfrich stereophenomenon). Measurements of the near and far displace¬ ments of a black vertical rod have been obtained for a wide range of target velocities under each of several conditions of unequal binocular retinal illumi¬ nance.
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