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. Author manuscript; available in PMC: 2020 Aug 21.
Published in final edited form as: Neuron. 2019 Jun 18;103(4):658–672.e6. doi: 10.1016/j.neuron.2019.05.036

Figure 6: Nonlinearity of hotspots.

Figure 6:

A: The RF of an OFF SM cell is shown at top, and again at bottom with two regions targeted for stimulation with equal weight in the RF. Scale bar: 200 μm.

B: Average firing rate of the SM cell as a function of instantaneous contrast on each input region. Red lines indicate contour at 5, 10, and 15 Hz.

C: The predicted firing rate of a linear model is shown as a function of the instantaneous contrast on each input region; schematic shows signals from different input regions summing before rectification.

D: As in C, but for a nonlinear response model, in which signals from different input regions sum after rectification.

E: Mean square error in predicted firing rate from the nonlinear model fits is shown as a function of the error in the linear model fits, for 30 OFF SM cells from 6 recordings.