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In this issue, Griesius et al report that heterozygous Dlg2+/‐ rats showed a reversal learning impairment on a specific bowl‐digging task, whereas other reversal tasks were unaffected. The study suggests that Dlg2 gene disruption, which has been linked to neuropsychiatric disorders, including schizophrenia, may cause relatively specific impairments in reversal learning, an important aspect of cognitive...