Table 1

Cohort and task instance

Cohort	N	Age (month old)	Sex	Instance 1	Instance 2
1	20	2–3	Male	BM1
2	20	2	Male	BM3
3	20	3	Male	BM3	BM1
4	17	2	Male	BM1'	BM1
5	14^a	3	Male	BM1	BM3
S1	16	2	Male	BM3^b
S2	8	2	Male	CFC	BM1

N = number of mice in each cohort at instance 1. CFC = contextual fear conditioning.
↵a One mouse was found dead in a blank between instances 1 and 2.
↵b Scopolamine hydrobromide was injected 20 min before the beginning of the probe test.