By Professor Dr. Guy A. Orban (auth.)
The invitation through the editors of the sequence "studies of mind functionality" to give a contribution a monograph at the visible cortex offers me the chance to offer in a focused demeanour a lot of the paintings i've got performed at the visible cortical parts of cat and monkey. although, the sphere of visible cortical physi ology is so energetic and so diversified that the presentation of in simple terms my very own paintings could have given a really incomplete view of visible cortical functioning. for that reason this monograph additionally experiences many of the reviews conducted at the topic within the final twenty years. the place attainable i've got attempted not just to explain the cortical equipment but additionally its attainable useful goal concerning imaginative and prescient. In doing this i've got expressed my own perspectives instead of simply reviewing the experimental evidence. a lot of the paintings awarded during this monograph has been supported through the nationwide learn Council of Belgium and the examine Council of the Catholic collage of Leuven. I show my gratitude to them. i've got en joyed participating in those reports with P. O. Bishop, H. Kato, H. Kennedy, ok. P. Hoffmann, H. Maes, J. Duysens, E. Vandenbussche, and H. van der Glas. i'm a lot indebted to all those that have commented on previous types of this monograph: J. Allman, H. Barlow, J. BuBier, M. Callens, J. Duysens, O. J. Griisser, P. Heggelund, H. Kennedy, L. C. Orban and L. Palmer.
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Additional resources for Neuronal Operations in the Visual Cortex
Similarly for the lateral and dorsal banks of the middle and posterior suprasylvian sulci, respectively. The insert shows the perimeter charts with the principal visual field landmarks. E) A schematic diagram of the representation of the visual field found in areas 20a, 20b, 21 a, and 21 b on the unfolded cortex. Inserts: perimeter chart and location of areas 20a, 20b, 21 a and 21 b on the lateral view of the cat hemisphere with the posterior ectosylvian gyrus removed (the portions of areas 20a and 20b on the medial surface have been swung out).
The global divergence factor at the geniculo-cortical level of 40 could as well result from an average local convergence factor of I and an average local divergence factor of 40, as from a mean local convergence factor of 5 combined with a mean local divergence factor of 200 and so on. Given the overrepresentation of the central portion of the visual field in the retino-geniculo-cortical pathway of the macaque it is interesting to examine separately the global divergence and convergence for the parts of the pathway subserving central and peripheral vision (see Table 1/IB).
Using this factor Daniel and Whitteridge (1961) were able to show that in the old world monkey (mainly the baboon) cortical magnification decreased monotonically with eccentricity. Direct comparison of this linear factor with retinal density of ganglion cells is not possible since the latter measure is an areal measurement. In fact there is a long standing dispute in the literature regarding whether M (the linear magnification) is proportional to D (retinal density) or (see Hughes, 1977 and Rovamo and Virsu, 1979 for discussion).
Neuronal Operations in the Visual Cortex by Professor Dr. Guy A. Orban (auth.)