By Risto Miikkulainen, James A. Bednar, Yoonsuck Choe, Joseph Sirosh
This e-book provides a unified computational method of knowing the constitution, improvement, and serve as of the visible cortex. It studies the present theories of the visible cortex and the organic information on which they're established, and provides an in depth research of the laterally hooked up self-organizing map version and effects bought thus far. including the software program package deal Topographica, it serves as a entire starting place for destiny study in computational neuroscience of the visible cortex.
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Additional resources for Computational Maps in the Visual Cortex
The LGN and V1 activation in response to a sample input on the retina is displayed in gray-scale coding from white to black (low to high). 1), and only certain combinations exist in the image. This basic LISSOM model will be used in Part II to understand input-driven self-organization, cortical plasticity, and functional effects of adapting lateral connections. In Part III, the model is further extended with subcortical and higher level areas to study prenatal and postnatal development, and in Part IV, with binding and segmentation circuitry in V1 to model perceptual grouping.
4 Approach 11 V1 LGN OFF ON Retina Fig. 4. Basic LISSOM model of the primary visual cortex. The core of the model consists of a two-dimensional array of computational units representing columns in V1. These units receive input from the retinal receptors through the ON/OFF channels of the LGN, and from other columns in V1 through lateral connections. The solid circles and lines delineate the receptive ﬁelds of two sample units in the LGN and one in V1, and the dashed circle in V1 outlines the lateral connections of the V1 unit.
Areas of the retina where light spots excite this neuron are plotted in white (ON areas), areas where dark spots excite it are plotted in black (OFF areas), and areas with little effect are plotted in medium gray. e. their ON and OFF areas cover a small speciﬁc portion of the retina. (a) ON cells are found in the retina and LGN, and prefer light areas surrounded by dark. (b) OFF cells have the opposite preferences, responding most strongly to a dark area surrounded by light. e. have no preferred orientation.