Difference of Gaussians, Integrate-and-Fire
This difference of Gaussian (DoG) model consists of a linear filter
followed by a conductance-driven integrate-and-fire unit. The
surround Gaussian is delayed relative to the center, and each Gaussian
has a separable temporal filter.
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The visual stimulus is convolved with a 3D spatiotemporal linear
filter that is constructed from the components shown above. The
filter is the difference between a narrow center filter and a wider
surround filter. The center and surround filters are each the product
of a 2D Gaussian and a biphasic temporal function.
The output of the linear filter is scaled and offset and taken as the
excitatory conductance input to a leaky integrate and fire spiking
model. Gaussian filtered Gaussian white noise is added to this