Figure 6. Behavioral discrimination of good and bad objects days and months after last reward association.
(A) Objects were tested in a free viewing task days or months after reward training while reward learning with other objects were in progress. (B) Free viewing task: good and bad objects were randomly selected and shown to the monkey for viewing in the absence of reward. (C) Behavioral discriminability (AUC) of objects based on days-old and months-old values as measured by first saccade after display onset in both monkeys (monkey B: t10>4.9, P<10−3 monkey days-old and months-old AUC, t20=0.63, P=0.63 difference in AUC, monkey R: t9=2.8, P=0.01 days-old and t8=5.9, P<10−3 months-old AUC, t17=0.89, P=0.38).