Computer Vision Pattern Recognition

Exploration of Cortical Function: Imaging and Modeling by M. Stetter

By M. Stetter

Exploration of Cortical Function summarizes contemporary learn efforts aiming on the revelation of cortical inhabitants coding and sign processing innovations. subject matters comprise optical detection innovations of inhabitants task within the sub-millimeter variety, complicated equipment for the statistical research of those info, and biologically encouraged neuronal modeling ideas for inhabitants actions within the frameworks of optimum coding, statistical studying conception, and mean-field recurrent networks.

Exploration of Cortical Function is exclusive in that it covers one whole department of population-based mind study starting from recommendations for information acquisition over information research as much as modeling ideas for the quantification of sensible ideas. the amount covers a space that's of serious present curiosity to researchers engaged on cerebral cortex. the mix of types and snapshot research innovations to envision the task of huge cohorts of neurons is principally fascinating and liable to huge mistakes and debate.

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17 demonstrates a close relationship between the change in the cortical magnification factor and the receptive field size as a function of retinal eccentricity in the early visual system of macaque monkeys. Actually the inverse magnification factor (dots) and the average receptive field diameter (triangles) are almost perfectly correlated with each other. The product of the receptive field size and the magnification factor is constant and corresponds to an area of about 1 mm in diameter. This important finding suggests that on average each classical receptive field is processed by roughly 1 mrrr' of cortical tissue, irrespective of the location within the visual field.

15b summarizes a related effect which is called end-stopping. The plots show, how the neuronal response varies with the length (E) and width (F) of an optimally oriented stimulus. The response reaches its maximum, when the stimulus size fits the dimensions of the classical receptive field. When the stimulus further increases in length or width, it begins to cover part of the nonclassical surround of the cell and causes a suppressive effect. Not all cells show end stopping. 14a showed no contextual EXPLORATION OF CORTICAL FUNCTION 42 solid: center alone open: surr.

M orthogonal to the cortical surface, often show similar preferred orientations and are driven preferentially by the same eye. Each such column is called an orientation column. However, the columnar structure is not strictly preserved. , 1989). e. they are different for the different cortical layers. In monkeys, most of the layer 4a and 4cp neurons, and some of the 4ca neurons are spatial opponent rather than orientation selective (Blasdel and Fitzpatrick, 1984). Simple and complex 44 EXPLORATION OF CORTICAL FUNCTION neurons are mixed, however simple cells dominate in the superficial layers, 4ca and in layer 5, while complex cells are more frequent in layers 4b and 6 (Bullier and Henry, 1980).

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