Abstract
An experiment was performed in order to test Köhler's satiation hypothesis. It was hypothesized that an object, when seen in the upper half of the visual field would tend to be perceived as differing in size from when seen in the lower half of the visual field. Thirty male and female college undergraduates were required to make size judgements on pairs of circles which were projected on an opaque screen. The design employed a two-choice Method of Constant Stimuli, with controls for response bias and position effects. Significant results were found (binomial test, p = 0.013) for the field effect, with upper visual field stimuli judged larger than lower visual field stimuli. The implications for man's knowledge of the world were discussed.
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