Figure 9.
Population summary of LIP activity related to choices and outcomes. A, Fraction of LIP neurons that showed significant changes in their activity according to the animal's choice (top), the choice of the computer opponent (middle), and the reward in the current (Trial Lag = 0) or previous (Trial Lag = 1 to 3) trials. The statistical significance was determined using a linear regression model applied to the spike rates in a series of nonoverlapping 0.5 s window aligned to target onset (left columns) or feedback onset (right columns). Gray symbols show the results obtained from the regression model that also included the value functions, and the asterisks indicate that they are significantly different from the results obtained from the regression model without the value functions (black symbols; χ2 test, p < 0.05). B, Same results shown in A from the regression model without the value functions, sorted separately according to the tuning property of each neuron. Asterisks indicate that the values among the horizontally tuned (green), vertically tuned (red), and untuned (blue) neurons were significantly different (χ2 test, p < 0.05). Gray background corresponds to the delay period (left columns) or feedback period (right columns).