Can Psilocybin Change How We Learn From Bad Experiences? New Research Says Maybe

If you’ve spent any time in psychedelic spaces, you’ve heard some version of this story: someone takes a journey, and afterward, an old belief they’d carried for years just… loosens. A fear that felt permanent suddenly looks negotiable. A relationship they’d been replaying the same way for a decade gets a new angle.

It’s one of the most common things people report. And for just as long, it’s been one of the hardest things to explain with actual science.

A new 2026 study out of Oregon Health & Science University and the National Institute of Mental Health might be giving us a real clue — not proof, but a genuinely interesting piece of the puzzle.

What the researchers actually did

The study wasn’t in humans — it was in rats, which matters and we’ll come back to it. The animals had to make choices under uncertainty, picking between options that paid off unpredictably. Researchers gave some of them psilocybin, then tracked both their behavior and what was happening inside the medial prefrontal cortex — the part of the brain heavily involved in decision-making.

Earlier studies have already shown that psilocybin changes behavior. What’s new here is what it changed the animals were learning from.

The asymmetry: more weight on wins, less on losses

Normally, a brain learns from both outcomes — a win teaches you to repeat the choice, a loss teaches you to avoid it. Under psilocybin, that balance tipped. The rats updated their behavior more strongly after rewarded choices, and noticeably less after unrewarded ones.

In plain terms: good outcomes carried more weight. Bad outcomes carried less.

And this wasn’t only visible in what the rats did — it showed up in the brain itself. Neural activity tied to rewarded outcomes got stronger. Activity tied to non-rewarded outcomes got quieter.

There was also a second effect: under uncertainty, the rats explored more. They didn’t lock into one habitual choice as rigidly — though when an option was clearly better, they could still pick it reliably. This wasn’t chaos. It looked more like a temporarily wider field of options.

Why this fits what people describe

Most of daily life runs on prediction, whether we notice it or not. This never works out for me. People always leave. I already know how this goes. These aren’t usually conscious thoughts — they’re the background assumptions our brain builds from everything that’s happened before.

One influential theory in psychedelic research suggests that psychedelics may temporarily soften the grip of these “priors” — the expectations we bring into every new situation — so new, incoming information can actually get through. The researchers behind this study point to their own findings as a possible piece of that mechanism: reduced influence from prior biases, especially when things are uncertain.

That doesn’t mean the memory disappears. The hard thing that happened is still real, still there. What might shift is how much power it has over what happens next — for a while, the story you’ve told yourself doesn’t get to dominate the read on new experience quite as automatically.

The default mode network: turning down the volume

There’s a related piece of the puzzle that neuroscience keeps coming back to: the default mode network, or DMN.

The DMN is a set of connected brain regions that light up when you’re not focused on a task — when you’re daydreaming, ruminating, or running the same internal story about who you are and how things go for you. Researchers often call it the brain’s “narrator.” It’s deeply involved in self-referential thought: the loop that replays old memories, rehearses old fears, and keeps your sense of identity consistent from one day to the next.

Consistency is usually useful. But that same loop can also lock you into rigid, repetitive thinking — the exact kind of pattern the new psilocybin study is describing at a neural level.

Brain-imaging research on psychedelics has repeatedly found that they quiet activity in the DMN and loosen the connections that normally keep it running on autopilot. Think of it less like flipping a switch and more like turning the volume down on a voice that’s usually playing in the background at full blast. With that voice quieter, other parts of the brain that don’t usually talk to each other start communicating more freely.

That fits neatly with what the rat study found. A quieter DMN could be one of the mechanisms behind a softer grip from old “priors” — fewer old assumptions running the show, more room for something new to register.

We want to be careful here too: DMN research comes mostly from human neuroimaging studies, not from this particular rat study, and scientists are still working out exactly how the two lines of research connect. But together, they’re pointing in a similar direction — psychedelics seem to change how much weight the brain gives to old, familiar patterns, whether that pattern lives in a learned expectation or in the DMN’s habitual self-narrative.

This is also why context matters so much

If a psychedelic experience really does open a window where the brain is more receptive to new input, then what fills that window becomes the whole ballgame. Who you’re with. Where you are. What you’re paying attention to. What meaning you’re making of it in real time.

It’s a big part of why serious psychedelic research keeps circling back to set

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