When researchers pooled controlled studies of psilocybin microdosing, the cognitive effects were small, inconsistent, and often statistically insignificant. Across tasks measuring memory, attention, creativity, and executive function, psilocybin microdoses did not produce reliable improvements compared to placebo. Many participants felt more focused or uplifted, but those subjective impressions didn’t show up in objective testing. The data suggests that, for cognition specifically, psilocybin microdosing offers minimal measurable benefit — far less than popular claims imply.