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Science 5 November 1976:
Vol. 194. no. 4265, pp. 626 - 627
DOI: 10.1126/science.790567
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Articles

Science, Vol 194, Issue 4265, 626-627
Copyright © 1976 by American Association for the Advancement of Science

articles

Oldest horse brains: more advanced than previously realized

L Radinsky

Previous interpretations of early horse brains were based on an incorrectly identified fossil endocast, now believed to be from a condylarth. Newly prepared endocasts of Hyracotherium, the oldest horse and one of the earliest perissodactyls, reveal a relatively larger brain, with a more expanded neocortex, than existed in the condylarth ancestors of perissodactyls. Fifty million years ago, horse brains had suprasylvian, ectolateral, and lateral sulci, but the frontal lobe was undeveloped.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)