Cortical complexity in cetacean brains
Article first published online: 2 OCT 2005
Copyright © 2005 Wiley-Liss, Inc.
The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology
Special Issue: Nature's Experiments in Brain Diversity
Volume 287A, Issue 1, pages 1142–1152, November 2005
How to Cite
Hof, P. R., Chanis, R. and Marino, L. (2005), Cortical complexity in cetacean brains. Anat. Rec., 287A: 1142–1152. doi: 10.1002/ar.a.20258
- Issue published online: 25 OCT 2005
- Article first published online: 2 OCT 2005
- Manuscript Accepted: 17 AUG 2005
- Manuscript Received: 16 AUG 2005
- McDonnell Foundation
Cetaceans (dolphins, whales, and porpoises) have a long, dramatically divergent evolutionary history compared with terrestrial mammals. Throughout their 55–60 million years of evolution, cetaceans acquired a compelling set of characteristics that include echolocation ability (in odontocetes), complex auditory and communicative capacities, and complex social organization. Moreover, although cetaceans have not shared a common ancestor with primates for over 90 million years, they possess a set of cognitive attributes that are strikingly convergent with those of many primates, including great apes and humans. In contrast, cetaceans have evolved a highly unusual combination of neurobiological features different from that of primates. As such, cetacean brains offer a critical opportunity to address questions about how complex behavior can be based on very different neuroanatomical and neurobiological evolutionary products. Cetacean brains and primate brains are arguably most meaningfully conceived as alternative evolutionary routes to neurobiological and cognitive complexity. In this article, we summarize data on brain size and hemisphere surface configuration in several cetacean species and present an overview of the cytoarchitectural complexity of the cerebral cortex of the bottlenose dolphin. © 2005 Wiley-Liss, Inc.