FIGURE 4.

(a–d) The relationship between reading score and four non‐sensory parameters of the drift diffusion model (DDM). (a) decision threshold a, (b) variability in drift process starting point s_z, (c) non‐decision time t, and (d) variability in non‐decision time s_t. (e) Correlations between parameters of the DDM. Boxes indicate hierarchical clustering results (Ward's method) and stars indicate significant correlations after Holmes–Sidak correction for multiple comparisons: *p < 0.05, **p < 0.01, and ***p < 0.001. (f) Group comparisons for the three composite measures based on hierarchical clustering of the DDM parameters: d _comp: composite of s_z, s_t, and t, the a parameter, and v _comp: composite of the four drift rate parameters and s_v. Note that all three composite parameters are z‐scored. Error bars represent 1 SEM