Jon Hamilton

Fossils offer a detailed record of early human skulls but not the brains inside them.

So researchers have been using genetic material taken from those fossils to search for clues about how the human brain has evolved over hundreds of thousands of years.

And now they have succeeded in growing human brain organoids, or "minibrains," that contain the Neanderthal variant of a gene called NOVA1, a team reports in the journal Science.

Early in the pandemic, people with COVID-19 began reporting an odd symptom: the loss of smell and taste.

The reason wasn't congestion. Somehow, the SARS-CoV-2 virus appeared to be affecting nerves that carry information from the nose to the brain.

That worried neurologists.

A chemically tweaked version of the psychedelic drug ibogaine appears to relieve depression and addiction symptoms without producing hallucinations or other dangerous side effects.

The results of a study in rodents suggest it may be possible to make psychedelic drugs safe enough to become mainstream treatments for psychiatric disorders, the authors report Wednesday in the journal Nature.

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LULU GARCIA-NAVARRO, HOST:

During deep sleep, the brain appears to wash away waste products that increase the risk for Alzheimer's disease.

A host of new research studies suggest that this stage of sleep — when dreams are rare and the brain follows a slow, steady beat – can help reduce levels of beta-amyloid and tau, two hallmarks of the disease.

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