Figure 7.

Two dimensional linear non-linear model. Two dimensional linear non-linear models of four different cells representing the four non-linear function shapes: (A) Energy function. (B) Saddle function. (C) Ascend function and (D) Crescent function. Left panel: The two linear filters. Middle panel: The non-linear function where the generator units are normalized. A constant was added to the function in order for its minimum to be set to zero. This is legitimate since it does not affect the correlation coefficient. Right panel: One second of the real firing rate vs. the model's firing rate prediction. The model's firing rate was multiplied by a constant in order for its amplitude to match the true firing rate. This is legitimate since it does not affect the correlation coefficient.