Figure 5.

Mean threshold values versus coherence. (A) Caution increases with coherence in all DDM fits. Pure (blue) and first extended DDM (red) fits do not differ significantly, but difficulty condition is significant [F_{(4, 64)} = 3.91, p < 0.01, η² = 0.16]. Allowing the starting point range to vary in the second extended DDM (green) does not improve fits by AIC/BIC, but compared with the other two DDM fits, main effects of model [F_{(2, 32)} = 3.99, p < 0.05, η² = 0.02] and interaction of model type and difficulty condition [F_{(8, 128)} = 2.06, p < 0.01, η² = 0.01] are significant. (B) Caution increases with coherence in the first LBA fit, and decreases with coherence in the second LBA fit, with variable starting point range. A within-groups ANOVA shows that main effect of model type [F_{(1, 16)} = 5.62, p < 0.05, η² = 0.01] and interaction of model type and difficulty condition [F_{(4, 64)} = 4.29, p < 0.01, η² = 0.08] are both significant. Bars indicate standard errors for n = 17 subjects.