Cortical Magnification Theory Fails to Predict Visual Recognition
Tóm tắt
The sense of form is poor in indirect view. Yet the cortical magnification theory asserts that the disadvantage can be made up by scaling the image size according to the spatial variation in the mapping of the retina onto the cortex. It is thus assumed that all visual information passes through a functionally homogeneous neural circuitry, with the spatial sampling of input signals varying across the visual field. We challenge this notion by showing that character recognition in the visual field cannot be accommodated by any concept of sole size scaling but requires increasing both size and contrast of the target being viewed. This finding is formalized into a hyperbolic law which states that target size multiplied by log contrast is constant across the visual field. We conclude that the scalar cortical magnification theory fails for character recognition since the latter depends on multidimensional pattern representations in higher, i.e. striate and prestriate, cortical areas.
Từ khóa
Tài liệu tham khảo
Aubert H., 1857, Beiträge zur Kenntniss des indirecten Sehens. (I). Untersuchungen über den Raumsinn der Retina, Arch. Ophthalmol., 3, 1
Baumgartner G., 1990, Where do Visual Signals Become a Perception
Bourdon B., 1902, La Perception Visuelle de ľEspace
Drasdo N., 1991, Limits of Vision, 250
Hering E.(1899)Über die Grenzen der Sehschärfe.Ber. Verhand. Königlich‐Sächsischen Gesell. Wissensch. Leipzig/Math.‐Phys. Classe: Naturwissenschaft. Teil 16–24.
Hübner M., 1985, Hidden‐face recognition: Comparing foveal and extrafoveal performance, Hum. Neurobiol., 4, 1
Ogle K. N., 1950, Researches in Binocular Vision
Tolhurst D. J., 1988, Magnification factors and the organization of the human striate cortex, Hum. Neurobiol., 6, 247
Watanabe S., 1985, Pattern Recognition: Human and Mechanical
Wertheim T., 1894, Über die indirekte Sehschärfe, Zeitschr. Psychol. Physiol. Sinnesorg., 7, 172