Behavioral and morphological identification of the teleost hippocampus using mudskipper.

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In this study, we found that neurons showing cFos immunoreactivity were localized in the lateral part of the dorsal telencephalon in the mudskipper following the object discrimination learning. Since object discrimination is one of the most important abilities for spatial learning and since the function is undertaken in the hippocampus and the adjacent region in mammals, the lateral region of the dorsal telencephalon in fish may be comparable to the mammalian hippocampus.