Fig. 1: Cluster characteristics for arousal ratings during the generalization test.

Arousal generalization gradients for each cluster (a) and corresponding gradient parameters (b–d). Mean arousal responses (b) increased from clusters 1–5; CS-differentiation (c) was better in clusters 2 and 4 than clusters 1, 3, and 5; linear deviation scores (LDS; d) indicate more linear gradients in clusters 4 and 5 than clusters 1, 2, and 3. 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.