Summary: A new zebrafish study reveals the important role the cerebellum plays in cognition, decision making, and motor planning. In work published in Cell, researchers were able to track the activity of each neuron in the entire brain of zebrafish larvae and reconstruct the unfolding of neuronal events as the animals repeatedly made “left or right” choices in a behavioral experiment. […] Having this information, the researchers could look at the brain state of any one little fish, and 80 percent of the time guess correctly what the fish was about to do: They were able to predict the specific time at which the animals would initiate the turn, and its direction, in each trial.

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