Figure 7

Diffusion model simulations with absolute starting point (\(s_{z}\)) fixed across conditions. We fit the diffusion model to the data with \(s_{z}\) constant across conditions. All other details were the same as in the simulations from Fig. 6. The simulations produced virtually equivalent results as when fixing \(\frac{{s_{z} }}{a}\) across conditions, except that U-shaped curves emerged when the parameters \(\eta\) and \(s_{z}\) both had relatively large positive values.