Fig. 8.

Relationship between parameters of the DM and the ABDM. Solid lines show how the drift rate in the ABDM, $v_{\mathit{ABDM}}$, relates to the drift rate in the DM, $v_{\mathit{DM}}$. Each grey line shows the relationship between the drift rate parameters of the two models for a fixed value of non-decision time $t_{0_{\mathit{DM}}}$ in the classic DM. The left panel shows the results for a boundary separation value of $a_{\mathit{DM}}=8$ in the classic DM; the right panel shows the results for $a_{\mathit{DM}}=12$. Small black dots show the drift rate values in each model that correspond to a mean response time of 6 s. Drift rates for the ABDM are shown for a diffusion coefficient of $s_{\mathit{ABDM}}=1$ and ratio of boundary separation to drift rate of $c=1/8$. The bias parameter in the classic DM was set to $z_{\mathit{DM}}=a_{\mathit{DM}}/2$.