Electroencephalograms of Sharks

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Science  28 Aug 1964:
Vol. 145, Issue 3635, pp. 949-951
DOI: 10.1126/science.145.3635.949


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