THE FLICKER RESPONSE CONTOUR FOR THE ISOPOD ASELLUS
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چکیده
منابع مشابه
The Flicker Response Contour for the Isopod Asellus
The flicker response contour for the isopod Asellus is a simple probability integral (F - log I) over the whole determinable range (F = 1 to 51). This contrasts with the "distorted" asymmetrical curves obtained with Apis, Anax, and other arthropods with large convex eyes. The explanation of the distortion as due to mechanical conditions affecting photoreception is therefore confirmed, as the st...
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The flicker response contour for the frog Rana pipiens exhibits the duplex character typical for most vertebrates. By comparison (under the same conditions of temperature, 21.5 degrees , and light-time fraction, = 0.5), the low intensity section of the F - log I curve is the smallest thus far found. The cone portion of the curve is satisfactorily described by a probability integral. The rod par...
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By cytological criteria the retina of the gecko is devoid of cones. The visual cells are structurally rods# and are associated with a visual purple. ~ Determinations were made of the interdependence of flash frequency and flash illumination for threshold response to visual flicker, using the species Sphaerodactylus inaguae Noble. These measurements give a flicker response contour for flash cycl...
متن کاملThe Flicker Response Contour for the Gecko (rod Retina)
The flicker response contour for the gecko Sphaerodactylus (retina with only rods) agrees in all essential respects (intensity range, shape) with that for the turtle Pseudemys (cone retina), as determined under equivalent conditions with the same apparatus. With experimentally determined correction for the expansion of the iris at the very lowest intensities, the F - log I contour for the gecko...
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The F - log I curve for threshold response to visual flicker has been determined for the crayfish Cambarus bartoni. As predicted on the basis of the higher curvature of the optic surface, the flicker response contour is more asymmetrical than for bee and dragonfly nymph under comparable conditions of temperature and light time fraction of flash cycle. The mechanical origin of this asymmetry is ...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1939
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.22.4.451