FMR1 and fragile X syndrome: Mouse and zebrafish models of FMR1 mutation have revealed impaired processing of visual (Goel et al., 2018) and auditory (Constantin et al., 2020) information, respectively, and are systems in which testing of therapeutics offers hope of ameliorating FXS (Chen et al., 2011; Dinday and Baraban, 2015; Wiley et al., 2017; Goel et al., 2018).