Data from: Sex differences in the cognitive abilities of a sex-changing fish species Labroides dimidiatus

Males and females of the same species are known to differ at least in some cognitive domains, but such differences are not systematic across species. As a consequence, it remains unclear whether reported differences generally reflect adaptive adjustments to diverging selective pressures, or whether differences are mere side products of physiological differences necessary for reproduction. Here we show that sex differences in cognition occur even in a sex-changing species, a protogynous hermaphrodite species where all males have previously been females. <br><br>