Figure 1

Behavioral training of premise pairs and SE testing during neuroimaging. The matching-to-sample pre-imaging procedure used to establish four premise pairs in two distinct classes (Class 1: A1:B1, B1:C1 and Class 2: A2:B2, B2:C2). During functional neuroimaging, two stimuli were presented (e.g., A2 C2) and subjects made yes/no judgments indicating whether the stimuli were conditionally related. Within-class derived relations consisted of Symmetry (B A; C B), Transitivity (A C) and Equivalence (C A) relations. Foils consisted of unrelated cross-class stimulus pairs that were not conditionally related (e.g., A1 B2).