Table 1.

The density of excitatory synapses in the BLA for each group measured at 1 and 24 h after the CPP test

Synapse type	Behavioral conditioning regimen
	Saline	Delayed pairing	AMPH CPP
Total asymmetric (1 h)	1.08 ± 0.06	1.28 ± 0.01	1.77 ± 0.19*
Total asymmetric (24 h)	1.18 ± 0.06	1.37 ± 0.11	1.89 ± 0.10*
Asymmetric axospinous (1 h)	1.00 ± 0.07	1.17 ± 0.04	1.64 ± 0.21*
Asymmetric axospinous (24 h)	1.01 ± 0.05	1.14 ± 0.09	1.68 ± 0.09*
Asymmetric axodendritic (1 h)	0.12 ± 0.02	0.10 ± 0.02	0.19 ± 0.01*
Asymmetric axodendritic (24 h)	0.14 ± 0.01	0.12 ± 0.01	0.20 ± 0.02*
Multisynaptic boutons (1 h)	0.03 ± 0.004	0.04 ± 0.002	0.07 ± 0.011*
Multisynaptic boutons (24 h)	0.05 ± 0.006	0.04 ± 0.005	0.07 ± 0.004*

Data are expressed as mean synapses per cubic micrometer ± SEM.

*p < 0.05 versus delayed pairing and saline groups.