Abstract
The apparent stereoscopic difference in distance of two after-images in the two eyes induced by two long narrow gas discharge tubes mounted vertically was measured by comparison with suitably arranged illuminated beads. The subject could have no knowledge of the actual difference in distance of the tubes prior to their being discharged. Data were obtained for induction of the after-images (a) in the two eyes at the same time and (b) successively in each eye separately. Results showed a high correlation for simultaneous exposures and a fair correlation for successive exposures.
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