The Journal of General Physiology
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The Journal of General Physiology, Vol 51, 255-260, Copyright © 1968 by The Rockefeller University Press

ARTICLE

Spectral Sensitivity of the Planarian Ocellus

H. Mack Brown 1, Hiroshi Ito 1, and Thomas E. Ogden 1

1 From the Departments of Neurology and Physiology, University of Utah College of Medicine, Salt Lake City, Utah 84112.

Dr. Brown's present address is Physiology Research Laboratory, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92037

The ocellar potential (OP) of planaria was recorded using microelectrode techniques. The action spectrum and spectral sensitivity of the OP are described. Maximum OP sensitivity was found with 508 nm light. A moderate increase in sensitivity to blue light was observed. This is typical of many invertebrate photoreceptors and was shown, by selective chromatic adaptation, not to indicate the presence of a second pigment.

Submitted on July 10, 1967


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