Download e-book for iPad: Exploration of Cortical Function: Imaging and Modeling by M. Stetter

By M. Stetter

Exploration of Cortical Function summarizes contemporary examine efforts aiming on the revelation of cortical inhabitants coding and sign processing recommendations. themes comprise optical detection innovations of inhabitants task within the sub-millimeter variety, complex tools for the statistical research of those facts, and biologically encouraged neuronal modeling recommendations for inhabitants actions within the frameworks of optimum coding, statistical studying idea, 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 suggestions for info acquisition over information research as much as modeling ideas for the quantification of sensible ideas. the amount covers a space that is of serious present curiosity to researchers engaged on cerebral cortex. the mix of versions and snapshot research strategies to check the job of huge cohorts of neurons is principally exciting and liable to significant errors and debate.

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PR: photoreceptor, HC: horizontal cell, BP: bipolar cell, GC: ganglion cell. circles with "plus"-sign excitatory connection. Circles with "minus"-sign: inhibitory connection. Besides the subdivision into ON- and OFF- neurons, there exists a third subdivision of retinal ganglion cells into a-neurons and ,B-neurons, and these cell types show profound functional differences (cf. section 2). Lm converge to roughly 1 million ganglion cells. The lateral organization of the retina is very inhomogeneous: Near the center of the retina, where the lens focuses the image of objects fixated by the eyes, we find the fovea, where visual patterns can be most highly resolved.

Four parvocellular or P-cell and two magnocellular or M-celllayers. Axons from the a-retinal ganglion cells terminate in the M-layers and ,B-ganglion cells in the P-layers. 4a). 4b. , 1994). I-cells differ from the other cell types in the termination zones of their axons, however little is known about their input. Parallel to the LGN layers, the topographic order of the afferent projection is preserved. 5 shows, how polar coordinate lines in the left hemisphere of the visual field (left) are represented in one LGN layer (right) (Connolly and Van Essen, 1984).

15. (a) Response of two cells from macaque VI to a center stimulusas a function of the orientationof an annular surroundoutside the classicalreceptive field (black filled circles; stimulus geometry is shown at the bottom right; from (Levitt and Lund, 1997)). Solid line: Response to stimulation by the center alone. Open circles: Response to stimulation by the surround alone. Black filled triangles mark the fixed center orientation. Both cells show isoorientationsuppression, and a slight facilitation for orthogonal orientations.

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