Figure 3:

Delayed match-to-sample task. Repeated-measures ANOVA results of the delayed match-to-sample task (colors indicate P values of significant voxels, cluster-based P < .05; K ≥ 10) superimposed to a standard brain template. A, Probability map overlays show positive drug × time interactions in favor of a methylene blue effect in the bilateral inferior frontal gyri during the encoding phase, B, in the right superior frontal gyrus, left middle frontal gyrus, and posterior cerebellum during the maintenance phase, and, C, in the right inferior frontal gyrus and cuneus during the retrieval phase (n = 26, with 24 degrees of freedom). D, Representative blocks from the delayed match-to-sample task show the encoding, maintenance, retrieval, feedback, and rest phases as demarcated by set times.