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Science 28 August 1964:
Vol. 145. no. 3635, pp. 949 - 951
DOI: 10.1126/science.145.3635.949
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Articles

Electroencephalograms of Sharks

Perry W. Gilbert 1, Edward S. Hodgson 1, and Robert F. Mathewson 1

1 Cornell University, Ithaca, New York, Columbia University, New York, and Lerner Marine Laboratory, Bimini, Bahamas

Patterns of electrical potentials recorded from the brains of sharks exhibit definite relationships to chemical and visual stimuli. Forebrain potentials reflect olfactory processes. Both restrained and free-swimming sharks exhibit mesencephalic responses to light and neural triggering of respiratory reflexes from the medulla. Early evolution of typical vertebrate brain functions, with emphasis upon chemoreception, is indicated

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