Scientists were able to track the brain activity of a zebrafish that was injected with ultra-sensitive green fluorescent proteins. The researchers observed that the fish's activities corresponded accordingly with the flashes of light that traveled across its brain. Now, scientists are hoping to study the whole brain. "We will explore neurons that work while the fish learns and thinks," said one researcher. "This will lead to an understanding of the fundamental neuronal circuits at work during human thought."
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