If you’ve ever been to London, you know that navigating its wobbly grid, riddled with curves and dead-end streets, requires impressive spatial memory. Driving around London is so demanding, in fact, that in 2006 researchers found that it was linked with changes in the brains of the city’s cab drivers: Compared with Londoners who drove fixed routes, cabbies had a larger volume of gray matter in the hippocampus, a brain region crucial to forming spatial memory. The longer the cab driver’s tenure, the greater the effect.
The study is a particularly evocative demonstration of neuroplasticity: the human brain’s innate ability to change in response to environmental input (in this case, the spatially demanding task of driving a cab all over London). That hard-won neuroplasticity required years of mental and physical practice. Wouldn’t it be nice to get the same effects without so much work?
To hear some people tell it, you can: Psychedelic drugs such as psilocybin, LSD, ayahuasca, and Ecstasy, along with anesthetics such as ketamine, can enhance a user’s neuroplasticity within hours of administration. In fact, some users take psychedelics for the express purpose of making their brain a little more malleable. Just drop some acid, the thinking goes, and your brain will rewire itself—you’ll be smarter, fitter, more creative, and self-aware. You might even get a transcendent experience. Popular media abound with anecdotes suggesting that microdosing LSD or psilocybin can expand divergent thinking, a more free and associative type of thinking that some psychologists link with creativity.
Research suggests that psychedelic-induced neuroplasticity can indeed enhance specific types of learning, particularly in terms of overcoming fear and anxiety associated with past trauma. But claims about the transformative, brain-enhancing effects of psychedelics are, for the most part,…
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