We propose a generalized energy model of complex cells to describe modulatory contextual
influences on the responses of neurons in the primary visual cortex (V1). Many orientationselective
cells in V1 respond to contrast of orientation and motion of stimuli exciting the classical
receptive field (CRF) and the non-CRF, or surround. In the proposed model, a central spatiotemporal
filter, defining the CRF, is nonlinearly combined with a spatiotemporal filter extending into the non-
CRF. These filters are assumed to describe simple-cell responses, while the nonlinear combination of
their responses describes the responses of complex cells. This mathematical operation accounts for
the inherent nonlinearity of complex cells, such as phase independence and frequency doubling, and
for nonlinear interactions between stimuli in the CRF and surround of the cell, including sensitivity to
feature contrast. If only the CRF of the generalized complex cell is stimulated by a drifting grating, the
model reduces to the standard energy model. The theoretical predictions of the model are supported
by computer simulations and compared with experimental data from V1.
CitationDellen, B.; Clark, J.; Wessel , R. Contextual interactions in a generalized energy model of complex cells. "Spatial vision", 2009, vol. 22, núm. 4, p. 301-324.
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