Amphibian spatial cognition, medial pallium and other supporting telencephalic structures
Vertebrate hippocampal formation is central to conversations on the comparative analysis of spatial cognition, especially in light of variation found in different vertebrate classes. Assuming the medial pallium (MP) of extant amphibians resembles the hippocampal formation (HF) of ancestral stem tetr...
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Veröffentlicht in: | Neuroscience and biobehavioral reviews 2024-08, Vol.163, p.105739, Article 105739 |
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Zusammenfassung: | Vertebrate hippocampal formation is central to conversations on the comparative analysis of spatial cognition, especially in light of variation found in different vertebrate classes. Assuming the medial pallium (MP) of extant amphibians resembles the hippocampal formation (HF) of ancestral stem tetrapods, we propose that the HF of modern amniotes began with a MP characterized by a relatively undifferentiated cytoarchitecture, more direct thalamic/olfactory sensory inputs, and a more generalized role in associative learning-memory processes. As such, hippocampal evolution in amniotes, especially mammals, can be seen as progressing toward a cytoarchitecture with well-defined subdivisions, regional connectivity, and a functional specialization supporting map-like representations of space. We then summarize a growing literature on amphibian spatial cognition and its underlying brain organization. Emphasizing the MP/HF, we highlight that further research into amphibian spatial cognition would provide novel insight into the role of the HF in spatial memory processes, and their supporting neural mechanisms. A more complete reconstruction of hippocampal evolution would benefit from additional research on non-mammalian vertebrates, with amphibians being of particular interest.
•Hippocampal formation (HF) is central for comparative analysis of spatial cognition.•Amphibian medial pallium (MP) is the homologue of the mammalian hippocampus.•HF of amniotes could have started with an undifferentiated MP-like cytoarchitecture.•Reconstruction of hippocampal evolution would benefit from further amphibian research. |
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ISSN: | 0149-7634 1873-7528 1873-7528 |
DOI: | 10.1016/j.neubiorev.2024.105739 |