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Modeling spatial contrast sensitivity in responses of primate retinal ganglion cells to natural movies

Fig 3

Schematic of the spatial contrast (SC) model.

For a given cell, the incoming stimulus is first convolved with the cell’s temporal filter to yield the effective stimulus frame h_s (overlaid here with the 3- contour of the spatial filter). From this, the mean light intensity signal I_mean and the spatial contrast signal LSC are computed by using the cell’s spatial filter u_s as weights. The I_mean and LSC are linearly combined with a weight parameter w used to scale the LSC contribution, and the combined signal is transformed by an output nonlinearity to yield the model’s firing rate response. Scale bars: spatial: 300 μm, temporal: 100 ms. Frame of the stimulus taken from an open-source movie licensed under CC BY 3.0 [28].

doi: https://doi.org/10.1371/journal.pcbi.1014157.g003