Fig. 2.

Relationship between change in salivary alpha amylase (sAA) and pattern separation. (A) Change in sAA, indexing the levels of endogenous NE, was correlated with separation bias scores (an index of pattern separation performance) (B) Even when overall memory performance is taken into account (dividing the separation bias by the target hit rate), the sAA change reliably predicts pattern separation performance. Both tests were conducted using nonparametric Spearman’s correlation.