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on the 31st of january 2013, a short video in which you can see a real thought happening was released by japanese scientists. they used GCaMPs (which are genetically encoded calcium indicators) to show tectal activity within the brain of a zebrafish.
the reason they used zebrafish is because these fish are transparent in their embryonic and larval stages, making it easier to monitor neuronal activity. the signals which are visible come from the zebrafish perceiving a swimming paramecium (small protozoa).
