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Modelle neuronaler Systeme


Cortical Orientation Map Development from Natural Images: the Role of Cortical Response Amplification in V1
Zitatschlüssel Piepenbrock2001
Autor Piepenbrock, C. and Obermayer, K.
Buchtitel Neural Coding of Perceptual Systems
Seiten 161 – 168
Jahr 2001
Herausgeber W. Backhaus
Verlag World Scientific Publishers
Zusammenfassung Simple cells in the primary visual cortex respond selectively to oriented stimuli. It has been proposed that such feature detecting neurons should generate a sparse representation of the visual world and orientation selective receptive fields are in this sense optimal spatial filters for natural visual environments. In this contribution we show that a competitive Hebbian development model driven by natural images may generate a topographic projection from the lateral geniculate nucleus to the primary visual cortex as well as orientation selective receptive fields. The resulting representation is sparse and the degree of sparseness depends on the recurrent dynamics, i.e., the lateral competition among the cortical neurons. Simulations show that for weak competition, the resulting receptive fields are global and unstructured and for intermediate competition, they refine and a topographic projection emerges. Finally, in the case of strong competition, the receptive fields act as oriented localized spatial filters arranged in a typical orientation selectivity map.
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