By Priv.-Doz. Dr. med. habil. Eberhart Zrenner (auth.)
"To clarify all nature is simply too tough a job for an individual guy or maybe for an individual age. Tis far better to do some with sure bet, and depart the remainder for others that come once you, than to provide an explanation for all issues ... " Sir Isaac Newton (1642-1727) This booklet describes and discusses a few new points 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 notion might be regarded as good. An try out could be made to higher comprehend the elemental mechanisms of colour imaginative and prescient utilizing a extra entire process which takes under consideration new mechanisms present in unmarried cells and relates them to these came upon legitimate for the whole visible process. 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 to be had strategies permitted.
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Extra info for Neurophysiological Aspects of Color Vision in Primates: Comparative Studies on Simian Retinal Ganglion Cells and the Human Visual System
13. D. Photopic relative luminous efficiency function (V 7\) indicated by broken line of stimulated receptors gradually increases. Larger spot sizes (up to 12° of visual angle), however, start to decrease the cell's activity; this is caused by the antagonistic action of the surround, which starts to be effective at a certain distance from the cell's RF center. , R+ /K or R-/R+ or G+ /G- or G-/G+ or R+G+ /KG- etc. (see Gouras 1968). Rare Cell Types To a small percentage of cells (9%), the classification described above did not apply.
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). There was another type of cells (2%) which was very sensitive to longwavelength light, responding with a tonic discharge; it was very insensitive to short-wavelength light, showing only very weak phasic discharges. The action spectrum of such a cell is shown in Fig.
3° and centered on the receptive field (lower row), the excitatory response to 456 nm light is still present, while the inhibitory response to 666 nm is practically lost. Stimulated by small, centered spots, the cell showed an action spectrum resembling only that of green sensitive cones. This test therefore reveals which mechanism (excitatory or inhibitory) forms the center of a cell. Since the action spectrum of the cones involved in these responses is known (cf. Fig. 4), it is proven that the cell shown in Fig.
Neurophysiological Aspects of Color Vision in Primates: Comparative Studies on Simian Retinal Ganglion Cells and the Human Visual System by Priv.-Doz. Dr. med. habil. Eberhart Zrenner (auth.)