A transgenic zebrafish larva that expresses the calcium indicator GCaMP in the tectal neurons is swimming freely in a small camber with a paramecium (in the right, circled). When the paramecium passed near the right-eye, Ca2+ signals were detected in the brain (a small circle on the left) and the larva initiated prey capture behavior (approach swimming towards the bait). Published on Current Biology, Muto et al. (www.cell.com
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