HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Enroth-Cugell, C. Articles by Shapley, R. M. Search for Related Content PubMed PubMed Citation Articles by Enroth-Cugell, C. Articles by Shapley, R. M.

1. Evidence was obtained that the impulse/quantum (I/Q) ratio of the central response mechanism of retinal ganglion cells in the cat is controlled by the steady effective retinal flux of the background.

2. One experiment revealed that the I/Q ratio was decreased as the area of an adapting spot, of constant illumination, was increased. The curve relating the I/Q ratio to background flux was the same regardless of the size of the adapting spot.

3. The effective central summing area of many retinal ganglion cells was determined. For the same cells, the transition level (Enroth-Cugell & Shapley, 1973) of the impulse/quantum curve was also measured. Diffuse illumination at the transition level was inversely proportional to the effective summing area, when variation in dark-adapted sensitivity between cells was taken into account.

4. Therefore, retinal ganglion cells with large central summing areas are more light-adapted by any given diffuse background than cells with small centres.

This article has been cited by other articles:

				M. Carandini, J. B. Demb, V. Mante, D. J. Tolhurst, Y. Dan, B. A. Olshausen, J. L. Gallant, and N. C. Rust Do We Know What the Early Visual System Does? J. Neurosci., November 16, 2005; 25(46): 10577 - 10597. [Abstract] [Full Text] [PDF]

				E. J. Chichilnisky and R. S. Kalmar Functional Asymmetries in ON and OFF Ganglion Cells of Primate Retina J. Neurosci., April 1, 2002; 22(7): 2737 - 2747. [Abstract] [Full Text] [PDF]

				D. Chander and E. J. Chichilnisky Adaptation to Temporal Contrast in Primate and Salamander Retina J. Neurosci., December 15, 2001; 21(24): 9904 - 9916. [Abstract] [Full Text] [PDF]