Table 2.

Hippocampal cAMP-dependent PDE activity

Group	n	PDE, pmol/mg tissue
Naive	8	20.3  ±  0.88
Shocked	6	20.2  ±  1.15
Trained 0 h	6	20.9  ±  1.46
Trained 3 h	6	23.7  ±  1.63
Trained 6 h	6	21.1  ±  1.71
Trained 9 h	6	19.4  ±  1.53

Data are expressed as mean ± SEM.