Researchers have shown that a single dose of LSD can trigger measurable changes in brain function that last at least a week, according to a new randomized, double‑blind crossover study involving healthy adults.
Study design and methods
The trial enrolled 45 participants aged 21 to 55, each receiving a 100 µg dose of LSD and a placebo in separate sessions. Investigators used a sequence‑typing task to evaluate motor learning, recording both online practice gains and offline consolidation after practice. Perceptual processing was examined with auditory tetanation paired with electroencephalography and with paired‑associative stimulation via transcranial magnetic stimulation. Self‑report questionnaires captured perceived stress and cognitive flexibility, while blood samples measured brain‑derived neurotrophic factor (BDNF) levels.
Acute effects and early sensory changes
During the acute phase, participants reported typical psychedelic effects, including altered visual perception and occasional muscle tension or shaking at peak intensity. Neurophysiological recordings indicated disrupted early sensory processing and reduced attention to novel stimuli, a pattern consistent with prior findings on serotonergic psychedelics. No significant change in BDNF concentrations was detected, suggesting that other neurotrophins may mediate longer‑term effects.
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In the days after dosing, selective improvements in motor memory consolidation emerged. On the day following the LSD session, subjects demonstrated faster execution of the sequence‑typing task without a corresponding loss in accuracy, indicating that speed gains were not simply a trade‑off.
These motor gains align with earlier animal work showing enhanced performance on tasks ranging from classical conditioning to fear extinction after LSD exposure.
While the precise mechanisms remain unclear, the authors propose that heightened neuroplasticity, altered motivation, or changes in arousal could underlie the observed speed improvements. The lack of BDNF elevation points to possible involvement of other growth factors or signaling pathways that support synaptic remodeling.
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Beyond motor performance, participants reported modest reductions in perceived stress and modest increases in cognitive flexibility throughout the week after dosing. These subjective shifts were largely positive and transient, resolving without lasting adverse effects.
Overall, the findings suggest that a single psychedelic exposure can open a brief window of heightened learning efficiency, lasting several days. This key learning period may allow the brain to reorganize connections more readily, potentially offering therapeutic avenues for conditions where neuroplasticity is compromised.
Future research will need to determine how long these benefits persist and whether they translate to clinical populations with depression, anxiety, or substance‑use disorders. The study adds to a growing body of evidence that psychedelics, when administered responsibly, may produce enduring changes in brain function that go beyond the immediate hallucinogenic experience.