>In a laboratory outside Cambridge sits a remarkable “biological computer”. Its 200,000 human brain cells, grown in the lab, lie on silicon circuitry that communicates their synchronised electrical activity on a screen to the outside world.

[…]

>Training involved giving the neurons a “reward” stimulus when they moved the paddle correctly, by applying electrical activity in the form of a sine wave, which the cells like. The “punishment” when they got it wrong was unpleasant white noise.

https://www.ft.com/content/713eab47-a1f1-4477-a7de-f2b150e2faac

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