. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. -1 O Center illumination x Surround illumination D Full-Field illumination 1 2 Cosine component Figure 1. A: Plot of the response of a single optic nen'e (ordinate) as a function of the size of the centrally located visual stimulus (abscissa). Davtime (gray points) and nighttime (black points) responses are normal- ized to their respective theoretical maximum excitatory response. As ex- pected, the response increases with the size of the stimulus. Solid lines show the growth of the response calculated on the basis of a gauss
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. -1 O Center illumination x Surround illumination D Full-Field illumination 1 2 Cosine component Figure 1. A: Plot of the response of a single optic nen'e (ordinate) as a function of the size of the centrally located visual stimulus (abscissa). Davtime (gray points) and nighttime (black points) responses are normal- ized to their respective theoretical maximum excitatory response. As ex- pected, the response increases with the size of the stimulus. Solid lines show the growth of the response calculated on the basis of a gaussian- shaped excitatory center. B: Vector plots of responses to illumination of the center (unfilled circle), surround (crosses), and full-field (squares) stimu- lation. Vectors are plotted relative to the sine wave stimulus, which has an angle ofO° and a length of 1. As explained in the te.\t, responses to center and surround alone predict with reasonable accuracv the response to full-field stimulation, which drives both the excitatory center and the inhihitorv surround. Such vector addition confirms the linear properties of the Limulus lateral eye. The nighttime vectors show a reduction in the difference bet\\<een excitation and full-field responses, indicating u de- crease in the strength of the inhibitory surround. response (open square) and thus confirms response linearity. We attribute the discrepancy between the vectors at night to response noise at low nighttime light levels caused by random photon Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass.
Size: 1229px × 2032px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
