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The percentages of correct choice responses (Choice) and the percentages of sample-response IRTs > 1500 ms with the new (blue and yellow) samples during four-sample matching acquisition for each Group SODD pigeon in Experiment 2 (previously assigned to the SID condition in Experiment 1). IRT data are labeled “drl” and “fr” as a function of whether each hue sample occasioned the same comparison choice as the line sample to which DRL or FR responding was required.
