Figure 28

Figure 28. The effects of feedback on horizontal-cell gain and speed. Using small-spot, white-noise stimuli, impulse functions were calculated for horizontal-cell light responses. S is the impulse function for the spot stimulus alone. S/A is the impulse function for the spot stimulus with additional maintained annular stimulation in the surround to stimulate feedback. In the presence of an annulus the peak time of the spot impulse function shortens, the amplitude increases, and the shape becomes biphasic or differentiating. A. Turtle horizontal cells. B. Catfish horizontal cells. In each case results are superimposed for 4 different horizontal cells. The illustration is from Chappell, et al., 1985 (264)

From: S-Potentials and Horizontal Cells

Cover of Webvision
Webvision: The Organization of the Retina and Visual System [Internet].
Kolb H, Fernandez E, Nelson R, editors.
Salt Lake City (UT): University of Utah Health Sciences Center; 1995-.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.