Figure 8.
Action selection in the normal situation (D = 100%). A, Top, In gray, the nonselective external input to the cortex. In black, average over 100 trials of the input. The input is zero outside the double arrow. The bell shape is given by Equation 7 with ϵ = 0, H1Ctx = 0.15, tm = 750 ms, and Dmvt = 500 ms. Bottom, The transient and weakly selective input to the striatal population in circuit 1 (black) and circuit 2 (gray) (Eq. 9 with HStr = 0.001). B, Activities averaged over a population of 20 neurons in GPi (top), thalamus (middle), and cortex (bottom) in response to the input depicted in A. Black, Circuit 1; gray, circuit 2. C, PETH of four units in GPi. D, Four units in the cortex. In C and D, Left (top and bottom), circuit 1; right, circuit 2.