By Priv.-Doz. Dr. med. habil. Eberhart Zrenner (auth.)
"To clarify all nature is simply too tough a role for someone guy or perhaps for someone age. Tis far better to do some with simple task, and depart the remainder for others that come when you, than to give an explanation for all issues ... " Sir Isaac Newton (1642-1727) This publication describes and discusses a few new features of col or imaginative and prescient in primates that have emerged from a chain of experiments carried out over the last eight years either on unmarried ganglion cells in monkey retina and at the visually evoked cortical strength in guy: corresponding psychophysical mechanisms of human belief could be regarded as good. An test can be made to raised comprehend the fundamental mechanisms of colour imaginative and prescient utilizing a extra accomplished technique which takes into consideration new mechanisms present in unmarried cells and relates them to these stumbled on legitimate for the full visible procedure. The processing of colour indications was once up from the retina to the visible cortex and to the percepq.tal facilities, so far as the on hand ideas permitted.
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Extra resources for Neurophysiological Aspects of Color Vision in Primates: Comparative Studies on Simian Retinal Ganglion Cells and the Human Visual System
Sample text
I . as II) Fig. 14. Action spectrum of a retinal "type IV" cell. These cells show very sensitive tonic responses (open symbois) to long wavelengths but much less sensitive phasic responses (hal/filled symbols) to shorter wavelengths. White background, 104 •2 td. J 400 500 600 700 Wavelength (nm) influenced by light of any intensity or wavelength, nor by moving objects. These cells seemed to have either non-visual functions or to be deprived of receptoral connections. Such cells were classified as ''undrivable'' (UD).
This picture strikingly shows that there is an almost continuous gradation in color-opponency concerning the strength of the opponent mechanisms involved, so that in RIG-opponent cells, under identical stimulus conditions, the neutral point can vary from 630 nm to 480 nm. 32 Types of Retinal Ganglion Cells and Their Distribution 0=3 6 Chromatic dominance in color opponent cells w 5 M8-C41 4 C\J 400 I E ::1.. ,.... J 600 0=1 6 . ~ 700 .... 400 6 5 4 4 500 600 .... 600 700 0=5 : RS ~ ~ 5 400 500 ~ 4 500 600 700 Fig.
Any middle- or short-wavelength light would excite as well as inhibit this cell and thereby produce phasic responses. Due to the change of response properties, correlated with the wavelength of the stimulus, these cells are not univariant. 6 Distribution of Classes of Ganglion Cells Across the Retina All types of ganglion cells described in this part of Chapter 3 are grouped in Fig. 15 according to their retinal location, all the way from the fovea (0° _1°) to the periphery (up to 12°). , Ecc. J others ~ __ ~ Phasic (28%) Fig.