Abstract
Detection thresholds were obtained for uniformly illuminated and non-uniformly illuminated (disk-annulus) stimuli. Then, the stimuli were presented at threshold and observers attempted to discriminate between uniform and non-uniform stimuli, and also made judgments of the apparent size of each stimulus. The uniform and non-uniform stimuli were not discriminated. Changes in apparent size were correlated with changes in detection thresholds. These findings support a multiple size-tuned mechanism interpretation.
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