Table 1.

Summary of human clinical findings with the AX+/BX− paradigm.

	Fear Learning (AX+ > NA)	Safety Signal Learning (BX−< AX+)	Safety Signal Transfer (AB < AX+)
Healthy volunteers	Yes	Yes	Yes
Combat PTSD	Yes	Yes/No	No
Civilian PTSD	Yes	No	No
Depression w PTSD	Yes	No	No
Depression w/o PTSD	Yes	Yes	Yes