Abstract
The effect of a large surround field (to which the observer is preadapted) on the apparent brightness of a 2° test field has been investigated by interocular matching using a total of eleven observers. Supplementary tests suggest that the data may be applicable for observations of a few seconds on test fields of between 1° and 9° angular subtense, and for apparent brightnesses from near threshold to blinding white. The data have been used to explain the phenomenon of brightness constancy in terms of adaptation influences. A family of scales of apparent brightness is proposed. Evidence has been obtained of an ocular interaction when the two eyes are adapted to different conditions.
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