Table 2. Exploration time (mean ± SEM; in s) in acquisition and test phases (behavioural tasks).

	Group of animals 1 (n = 15)
	acquisition 20min		acquisition 3h		acquisition 24h
	sense	antisense	sense	antisense	sense	antisense
acquisition test	29.3 ± 1.9	27.1 ± 2.0	29.1 ± 2.0	27.6 ± 2.4	30.6 ± 2.2	29.5 ± 2.1
	23.3 ± 2.6	19.7 ± 2.8	18.3 ± 1.7	27.2 ± 3.0	20.3 ± 2.0	22.5 ± 1.7
	Group of animals 2 (n = 9)
	retrieval 24h		consolidation 24h		object-in-place 3h
	sense	antisense	sense	antisense	sense	antisense
acquisition test	34.0 ± 2.7	30.5 ± 3.0	32.7 ± 2.5	27.5 ± 2.3	44.2 ± 5.4	44.4 ± 6.5
	28.9 ± 4.5	31.2 ± 2.2	26.6 ± 2.3	26.9 ± 3.6	25.9 ± 3.5	25.0 ± 2.4