One dose of LSD boosts learning the next day in mice, with stronger cognitive flexibility linked to serotonin 2A receptor signaling and delayed behavioral effects

LSD produced a delayed improvement in learning and cognitive flexibility in mice, with stronger performance appearing the day after a single dose rather than during the acute drug state. The central finding points to a time-shifted effect in which neural changes outlast immediate intoxication and may support faster adaptation to new tasks. Serotonin 2A receptor signaling appears to be a key mechanism behind this effect. The reported results connect psychedelic action at this receptor with next-day gains in reversal learning, a common measure of flexible behavior, suggesting that LSD may temporarily open a window for enhanced learning after the primary subjective effects fade. These findings matter because they separate potential cognitive benefits from the acute psychedelic experience and add to growing research on psychedelics, plasticity, and post-dose changes in brain function. Translating mouse results to humans remains uncertain, but the work supports closer study of delayed therapeutic and cognitive effects.