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An exploration of the Pulfrich effect
Author(s) -
WALLACH HANS,
GOLDBERG JOAN
Publication year - 1977
Publication title -
scandinavian journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 72
eISSN - 1467-9450
pISSN - 0036-5564
DOI - 10.1111/j.1467-9450.1977.tb00282.x
Subject(s) - transverse plane , latency (audio) , optics , homogeneous , psychology , retinal , physics , optometry , audiology , ophthalmology , computer science , medicine , anatomy , telecommunications , thermodynamics
.— The existence of a Pulfrich effect based on ocular convergence was demonstrated by having subjects with a neutral density filter over one eye observe a moving rod in a homogeneous environment. This effect was found to have a smailer magnitude than a Pulfrich effect that was obtained when the rod moved optically in the plane of a dot pattern and thus formed the central equivalents of retinal disparities with the dots of the pattern. Under the latter condition, the latency of subjects' reporting the depth effect was shorter when one end of the rod was visible than when both ends of the rod were concealed. This latency difference occurred because the visible end of the rod formed the equivalent of transverse disparities with the dots surrounding it. The presence of real transverse disparities is known to shorten latencies.