Firing-rate based network modeling of the dLGN circuit: Effects of cortical feedback on spatiotemporal response properties of relay cells
Fig 3
Illustration of spatial and temporal features of retinal input and coupling kernels.
Panel A: receptive-field function for the retinal input (left) and the connectivity kernels (right). The spatial functions are shown as one-dimensional plots, although they are (circularly symmetric) two-dimensional functions. Panel B, top: spatial connectivity patterns between presynaptic neurons in the top layer and a single postsynaptic neuron (red circle) in the bottom layer for Gaussian width parameters (a). The Gaussian curves superimposed on top layers illustrate the spatial extent of the input to the neuron in the bottom layer. Bottom: different scenarios for the temporal connectivity pattern. The time constant τ in the exponential decay function describes the duration, while Δ is the delay parameter. In the present example applications we have kept the time constant τ fixed at 5 ms. Panel C: spatial feedback configurations investigated in present study. The ON and OFF cells are marked with red and blue color, respectively. The spatial connectivity kernels are shown as one-dimensional plots where the fill color corresponds to the sign of the input (excitatory: red, inhibitory: blue).