Figure 2.

Extended version of the reduced model with the CD. A, The extension consists in adding the corollary discharge originating from the basal ganglia, an inhibitory input onto both units occurring just after a decision is made. B, Relaxation time constant of the system during the RSI (that is the relaxation dynamics toward the neutral attractor), with respect to the corollary discharge amplitude. The values are obtained by computing the largest eigenvalue λ of the dynamical system, Equations 1–6, when presenting a constant CD. The time constant is given by the inverse of the eigenvalue, τ = −1/λ. C, The time-sketch of the simulations can be decomposed into a succession of identical blocks. Each block, corresponding to one trial, consists of: the presentation of a stimulus with a randomly chosen coherence (gray box), a decision immediately followed by the removal of the stimulus, a waiting time of constant duration corresponding to the RSI.