When1: 1911
When2: 1922
Who: Carl Pulfrich [Pulfrich, Carl]
What: psychologist
Where: Jena, Germany
works\ Stereoscopic Vision and Measurement [1911]; Stereoscopy in the Service of Isochromatic and Heterochromatic Photometry [1922]
Detail: He lived 1858 to 1927. If people view pendulums with sunglasses over one eye and nothing over other eye, pendulums appear to move in elliptical paths, with depth {Pulfrich's pendulum} {Pulfrich stereophenomenon} [1921]. Perhaps, sunglass delays signal transmission from retina to brain {delay line explanation}, eye sees sunglass-filtered pendulum at previous position compared to uncovered eye, and different positions cause stereoscopic disparity and appearance of depth.
Actually, eye adaptation to lower illumination causes delay. Depth effect also happens with stroboscopically lit objects and in television-set "snow".
Social Sciences>Psychology>History>Perception
6-Psychology-History-Perception
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Date Modified: 2022.0224