Hierarchical cluster analysis produces two major clusters of animals. We analyzed dependent variables freezing, rearing, and grooming duration (in seconds) for all training phases (Pre, TS1, ITI, TS2, and Post) and freezing duration for both testing phases (pre-CS and CS) for each rat. Here, we show a scree plot (A) taken from the agglomeration schedule (Supplemental Table S5) and a clustering dendrogram (B) indicating at least two meaningful clusters. (C) Freezing and rearing during the training ITI are the best predictors for pre-CS freezing during the test and thus are displayed labeled by cluster as a 3D scatter plot with cluster centroid spikes. (D) Providing more detail, these data also are presented as a 2D matrix plot.
