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Researchers mapped 84,000 neurons in a mouse brain after it watched video clips. The 3D map links structure and activity.

From a cubic millimeter of brain tissue, scientists have constructed a precise, 3D map of the activity in a mouse’s brain, detailing 84,000 neurons and more than 500 million synapses.

Researchers mapped 84,000 neurons in a mouse brain after it watched video clips. The 3D map links structure and activity.

of a mouse’s brain and the beauty and complexity that you can ... using a special tool to shave it into more than 25,000 ...

Scientists at the Allen Institute, a research center in Seattle, then sliced that piece of the mouse’s brain into more than 25,000 layers, each a tiny fraction of the width of a human hair ...

Copyright 2025 The Associated Press. All Rights Reserved. Copyright 2025 The Associated Press. All Rights Reserved. This image provided by the Allen Institute on ...