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. Author manuscript; available in PMC: 2013 Jul 26.
Published in final edited form as: Neuron. 2012 Jul 26;75(2):342–351. doi: 10.1016/j.neuron.2012.03.041

Figure 2. Gain Field and Vector Relationships Illustrated in Simulated Cells.

Figure 2

(A) A cell with a weak gain field of hand (H) on target (T). (B) A cell with a moderate gain field of H on T. (C) A cell with a vector relationship between H and T (full shift). (D) A cell with a vector relationship between H and T (intermediate shift. (E) A cell with a vector relationship between H and T plus a superimposed H gain field.

Left panels show idealized matrix responses for a pair of variables (illustrated here with H and T). White represents a high firing rate and black represents a low firing rate. Small red arrows denote the gradient of each matrix response field. Center panels show the overall response field orientation calculated from the red gradient arrows. The response field orientation indicates the relative influence of each variable on the firing rate of the cell. Right panels list how each simulated cell was modeled and whether each type of relationship is categorized as separable or inseparable in the singular value decomposition analysis.