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BRIGHTNESS JUDGEMENTS AND STIMULUS SIZE AND DISTANCE
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.tb00848.x
Subject(s) - psychology , stimulus (psychology) , brightness , visual angle , second order stimulus , audiology , visual perception , communication , perception , cognitive psychology , optics , physics , neuroscience , medicine
Three groups of subjects were instructed to judge the relative brightness of two stimuli, the sizes and distances of which were varied to allow three visual angle relationships. Testing was carried out under reduced viewing conditions and the groups differed in terms of the criteria subjects were instructed to use in making brightness judgements. For all groups it was found that when the two stimuli were equal in luminous intensity the stimulus subtending the smaller visual angle was consistently judged to be less bright than the stimulus subtending the larger visual angle. Judgements made with ‘projective’ criteria were more a function of stimulus size and distance than were judgements made with either ‘objective’ or ‘apparent’ criteria.