FMR1 and fragile X syndrome: Among all the behavioral tests we performed, the most pronounced phenotypes were seen during habituation phases (Appendix Table S2), which suggests that Fmr1‐KO mice are hyperactive when faced with novelty and which correlates to the well‐established deficit in habituation, hypersensitivity, and hyperactivity observed in patients with FXS (Hagerman et al, 2017).