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STIMULUS WAVELENGTH VARIATION AND SIZE AND DISTANCE JUDGEMENTS
Author(s) -
OVER RAY
Publication year - 1962
Publication title -
british journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.536
H-Index - 92
eISSN - 2044-8295
pISSN - 0007-1269
DOI - 10.1111/j.2044-8295.1962.tb00820.x
Subject(s) - luminance , stimulus (psychology) , wavelength , chromatic scale , optics , apparent size , psychology , second order stimulus , visual angle , chromatic aberration , physics , visual perception , neuroscience , cognitive psychology , perception
Previous experiments which have studied the relationship between stimulus wavelength variation and size and distance judgements have confounded wavelength with luminance, which is known to be an effective variable. Using a rationale which combines the fact that light from stimuli of different wavelengths stimulates different areas of the retina (chromatic aberration) with the finding that under reduced viewing conditions two stimuli of the same wavelength are judged equal in both size and distance when they stimulate equal areas of the retina, it was predicted that when the subject was presented with two stimuli subtending the same visual angle and of the same luminance but of different wavelengths the stimulus of longer wavelength would be judged to be both larger and closer than the stimulus of shorter wavelength. This prediction was confirmed in the experiment.