Table 1.

Subject assignment and experimental design.

------Experimental Condition------		----------------Experimental Phase---------------
	Behavioral	Pre-exposure	Training	Sac	Testing
In situ	Baseline	Context A/B	Home cage	x
	Pre	Context A	Context A	x
	Alt-Pre	Context B	Context A	x
	Imm Shock	Handle	Context A	x
	No Shock	Handle	Context A	x
	Standard Context Fear	Handle	Cxt A 180s	x
Behavior	Pre	Context A	Context A		Context A
	Alt-Pre	Context B	Context A		Context A
	Imm Shock	Handle	Context A		Context A
	No Shock	Handle	Context A		Context A
	Standard Context Fear	Handle	Cxt A 180s		Context A