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Oldest Horse Brains: More Advanced Than Previously Realized

Leonard Radinsky
Science
New Series, Vol. 194, No. 4265 (Nov. 5, 1976), pp. 626-627
Stable URL: http://www.jstor.org/stable/1743025
Page Count: 2
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Abstract

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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