In tadpoles, the number of neurons expressing the neurotransmitter dopamine increases on exposure to light. Such plasticity might allow animals to match their brains' response to environmental stimuli.
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Thor, S. Light moulds plastic brains. Nature 456, 177–178 (2008). https://doi.org/10.1038/456177a
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DOI: https://doi.org/10.1038/456177a
