Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 11 May 1984:
Vol. 224. no. 4649, pp. 625 - 627
DOI: 10.1126/science.6710161
Prev | Table of Contents | Next

Articles

Science, Vol 224, Issue 4649, 625-627
Copyright © 1984 by American Association for the Advancement of Science

articles

Direct excitatory interactions between cones of different spectral types in the turtle retina

RA Normann, I Perlman, H Kolb, J Jones, and SJ Daly

Cone linear sensitivities to red and green stimuli were measured intracellularly in the dark- and light-adapted turtle retina. Test flashes of small diameter were used to minimize horizontal cell feedback. Light adaptation was achieved with either green or red background illumination. The ratio of cone sensitivities to red and green light depended on the color of the background light and differed from the ratio measured in the dark. Electron microscope studies of Golgi-stained turtle cones revealed direct synaptic connections between red and green cones mediated by cone telodendria. These data indicate that the red cone photoresponse is not univariant as has been previously supposed and suggest that mixing of signals from different spectral classes of cones can occur via direct excitatory connections between cones.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Field sensitivity action spectra of cone photoreceptors in the turtle retina.
I. Perlman, A. Itzhaki, H. Asi, and M. Alpern (1998)
J. Physiol. 511, 479-494
   Abstract »    Full Text »    PDF »
Relation of spectral types to oil droplets in cones of turtle retina.
T Ohtsuka (1985)
Science 229, 874-877
   Abstract »    PDF »


To Advertise     Find Products

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