Hilary Brueck, wearing a Kernel headset, looks at a computer monitor during a brain test.

We visited Kernel to test its $117,200 brain-scanning headset.

Description An icon in the shape of an angle pointing down.

A startup founded by Bryan Johnson spent a decade building a headset that measures brain activity using lasers.

Health correspondent Hilary Brueck went to Kernel's headquarters in Los Angeles to test the technology and learn how the company believes better brain data could help doctors, researchers, and even businesses understand how we think.

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