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Relationship of repetitive behaviors to total caudate volume. Legend: Spearman correlations of total caudate volume to total scores and number of forms endorsed (topographies) for repetitive behaviors of interest as measured by the Repetitive Behavior Scales, Revised, controlling for total brain volume and IQ. FXS: fragile X syndrome; FXS+Aut: fragile X syndrome with autism; iAut: idiopathic autism. * P < 0.05; ** P < 0.01.
