Volume 33 #2

Contents

1. Computation of eye optics of the cetacean’s eye
2. Neurophysiological mechanisms of two sequential orientations comparison in working memory
3. Contribution of the marginal peripheral retina to color constancy: Evidence obtained due to contact lens with implanted occluder
4. Contribution of the spectral and temporal mechanisms to analysis of complex sound signals
5. Role of the donor of NO molecules in regulation of primary sensory neuron responses
6. Identity documents forgery detection with mobile devices
7. Transient processes of visual evoked potentials in the tasks of human-computer interfaces
8. Algebraic reconstruction in case of limited GPU memory in the task of computed tomography
9. New criteria for neural network encoder learning in the string segmentation problem

Novel experimental data are presented to demonstrate participation of the marginal peripheral retina (MPR) in providing color constancy. According to A. Yarbus (Yarbus, 1975a, b; 1977; Yarbus, Rozhkova, 1977), the task of the MPR is to estimate spectral characteristics of the scene illumination presuming that they are directly related to the ambient light stimulating MPR. The estimates of illumination obtained at the MPR are supposed to be used for color normalization by perceptual color constancy mechanisms in all the visual field. Usually, MPR photoreceptors are stimulated by two principally different light flows: the light that enters the eye through the pupil and partially scatters inside all the eye media (pupillary component) and the light that reaches the retina from its outer side, e.i. “diasclerally”, going from the illuminated eye surface through all eye tunics (scleral component). These two components differ in their spectra because they have to pass different eye structures that make the scleral component more reddish than the pupillary one. Taking into account this difference, we have contrived a new experimental paradigm for verifying Yarbus’s hypothesis on the basis of changing the balance between these two components by means of contact lens with implanted opaque occluder. The occluder diminished the amount of scattered light reaching MPR photoreceptors from inside the eye ball but did not change the outside light flow. It was anticipated that resulting change of balance in favor of reddish scleral component should lead to relative increase of the red color coordinate in the red-green-blue estimates of illumination and, correspondingly, to shifting all the perceived colors in green-blue direction. Our experimental data on peripheral vision obtained in photopic conditions of illumination supported this prediction. In certain cases, transformations of colors appeared to be dramatic, e.g. saturated red could be perceived as saturated green.

Key words: color vision, peripheral visual field, peripheral blind retina, diasleral stimulation, color constancy, contact lens, implanted occluder

DOI: 10.1134/S0235009219020082

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