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In the group treated with psilocybin, adapting neurons sat at a resting voltage that was closer to the threshold for firing. This state is known as depolarization. It means the cells are primed to activate more easily. The bursting neurons in psilocybin-treated rats also showed increased excitability. They required less input to trigger a signal and fired at faster rates than neurons in untreated rats.

The rats treated with 25CN-NBOH also exhibited functional changes, though the specific electrical alterations differed slightly from the psilocybin group. For instance, the bursting neurons in this group were not as easily triggered as those in the psilocybin group. However, the overall pattern confirmed that the drug had induced a lasting shift in neuronal function.

These electrophysiological findings provide a potential explanation for the behavioral results. While the physical branches of the neurons may have pruned back to normal levels, the cells “remembered” the treatment through altered electrical tuning. This functional shift allows the neural circuits to operate differently long after the drug has left the body.

Now online! CRISPR screens in iPSC-derived neurons reveal that the E3 ubiquitin ligase CRL5SOCS4 ubiquitinates tau, that CUL5 expression is correlated with resilience in human Alzheimer’s disease, and that electron transport chain dysfunction alters tau degradation by the proteasome.

Spaceflight takes a physical toll on astronauts, causing muscles to atrophy, bones to thin and bodily fluids to shift. According to a new study published in the journal PNAS, we can now add another major change to that list. Being in microgravity causes the brain to change shape.

Here on Earth, gravity helps to keep the brain anchored in place while the cerebrospinal fluid that surrounds it acts as a cushion. Scientists already knew that, without gravity’s steady pull, the brain moves upward, but this new research showed that it is also stretched and compressed in several areas.

Brains on the move Researchers led by Rachel Seidler at the University of Florida reached this conclusion after studying MRI scans of 26 astronauts taken before and after their missions to the International Space Station. These were compared with scans from 24 volunteers who participated in a head-down tilt bed rest experiment. They spent 60 days lying at a six-degree downward angle to mimic how weightlessness causes bodily fluids and organs to move toward the head.

Some people don’t develop dementia despite showing signs of Alzheimer’s disease in their brain, and we’re starting to understand why