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. 2011 Nov 26;6(4):307–324. doi: 10.1007/s11571-011-9183-8

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© Springer Science+Business Media B.V. 2011

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Fig. 1 — a Schematic view of present model of the geniculate circuit for the ON X pathway in cat comprising ON retinal ganglion cells (g), ON geniculate relay cells (r), and cells from several cortical cell populations, both ON (c_n) and OFF (c^OFF_n). The feedback cross-connections (from OFF to ON) are shown as dashed lines. For the sake of clarity, only two populations (n = 1, 2) are shown, even though an arbitrary number of populations N are considered in our mathematical analysis, and input to OFF is not shown. The cortical OFF cells are driven by relay OFF cells not depicted in the figure. b Illustration of the mathematical model of the geniculate circuit. (n = 1, 2) represent the responses of ON retinal ganglion, ON relay, ON cortical, and OFF cortical cells respectively. K _jk (j, k = g, i, r, c_n) represents the coupling from ON neurons of type k onto ON neurons of type j. represents the cross-connection in the cortical feedback (dashed arrows), and K _rig represents the indirect feedforward inhibition via intrageniculate interneurons (dotted arrow)

Inline graphic — a Schematic view of present model of the geniculate circuit for the ON X pathway in cat comprising ON retinal ganglion cells (g), ON geniculate relay cells (r), and cells from several cortical cell populations, both ON (c_n) and OFF (c^OFF_n). The feedback cross-connections (from OFF to ON) are shown as dashed lines. For the sake of clarity, only two populations (n = 1, 2) are shown, even though an arbitrary number of populations N are considered in our mathematical analysis, and input to OFF is not shown. The cortical OFF cells are driven by relay OFF cells not depicted in the figure. b Illustration of the mathematical model of the geniculate circuit. (n = 1, 2) represent the responses of ON retinal ganglion, ON relay, ON cortical, and OFF cortical cells respectively. K _jk (j, k = g, i, r, c_n) represents the coupling from ON neurons of type k onto ON neurons of type j. represents the cross-connection in the cortical feedback (dashed arrows), and K _rig represents the indirect feedforward inhibition via intrageniculate interneurons (dotted arrow)