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The behavioral task used to study image performance. The subject performed a delayed match-to-category task and had to indicate (by releasing a lever) whether sample and test stimuli were of the same category, novel or familiar. If the sample and test were not identical, the subject had to wait until a 3rd stimulus was presented, which was always the same category as the sample (and required a lever release). Sample and test stimuli were both full-color RGB images.
