Figure 1

A. Stable (solid) and unstable (dashed) manifolds of the saddle point under speed (black) and accuracy (grey) conditions for one level of task difficulty (4% coherence). B. Time constant of the unstable manifold of the saddle for different task difficulties under speed and accuracy conditions. Coherence refers to the percentage of coherently moving random dots in a simulated decision task, where easier tasks have higher coherence.