Fig. 3: Cluster characteristics during the acquisition phase.

Ratings and skin conductance responses (SCR) for CS+ and CS− during acquisition (a) and the extracted characteristics reflected in mean responses (b) and CS-differentiation (c). The clusters’ response characteristics identified during the generalization phase (see Fig. 1) were already evident during acquisition (see text for detailed explanation). Clusters with the same letters do not differ on a Scheffé-corrected alpha level of 0.05. Error bars represent standard errors of the mean.