Recurrent processing during object recognition Supporting Information
نویسندگان
چکیده
In the mammalian brain, the retina and LGN compress the visual input into an efficient contrastcoded representation using center-surround contrast filters that are radially symmetric (which can be nicely approximated by the difference of two Gaussians, Enroth-Cugell & Robson, 1966; Young, 1987). Then area V1 encodes orientation and other features building upon this basic contrast-enhanced input. (Hubel & Wiesel, 1962) We compress this chain of filters into a single step by using oriented Gabor filters, which are defined as a Gaussian-shaped spatial weighting multiplying a planar sine wave oriented in a given direction:
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