Table 1.

Experimental designs

Experiment	Day 1	Day 2	Day 3	Day 4	Day 5	Day 6	Day 8
Corcoran and Maren, 2001, 2004	Cond	Ext 1	Ext 2	Ext 3	Ext 4	Ext 5	Test*
Experiment 1	Cond	Ext 1*	Test
Experiment 2	Cond	Ext 1	Test*

In previous studies, rats were given extinction training over 5 d, and intrahippocampal muscimol infusions (asterisks) were given before testing. In the present experiments, intrahippocampal muscimol infusions occurred before extinction training (experiment 1) or before testing (experiment 2) to test a role for the dorsal hippocampus in the contextual encoding of extinction and its context-specific retrieval after a single extinction training session, respectively. Cond, Conditioning; Ext, extinction.