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A teenager’s brain does not magically mature into its reasoned, adult form the night before his or her 18th birthday. Instead, aspects of brain development stretch into a person’s 20s — a protracted fine-tuning with serious implications for young people caught in the U.S. justice system, argues cognitive neuroscientist B.J. Casey of Yale University.

In the May 22 Neuron, Casey describes...

New artwork created by artificial intelligence does weird things to the primate brain.

When shown to macaques, AI-generated images purposefully caused nerve cells in the monkeys’ brains to fire more than pictures of real-world objects. The AI could also design patterns that activated specific neurons while suppressing others, researchers report in the May 3 Science.

This...

To communicate, people unable to talk often rely on small eye movements to spell out words, a painstakingly slow process. Now, using signals picked up by a brain implant, scientists have pulled entire sentences from the brain.

Some of these reconstructed words, spoken aloud by a virtual vocal cord, are a little garbled. But overall, the sentences are understandable, researchers from the...

When Molly was 10 months old, her parents took her to a Halloween party with other young families. While the other babies explored their surroundings, Molly sat and watched. She’s always been cautious, says Molly’s mom, Rachel. Early on, though, the little girl’s shyness didn’t raise red flags.

By the time Molly turned 4, however, life was getting harder — for everyone. Even though she...