. Author manuscript; available in PMC: 2015 Sep 1.

Published in final edited form as: J Behav Ther Exp Psychiatry. 2014 Mar 12;45(3):343–350. doi: 10.1016/j.jbtep.2014.02.005

Table 1.

Design summary of Experiment 1.

Groups	Preexposure			Acquisition	Test
Single/Moderate	30 X− (A)	30 X− (A)	30 X− (A)	3 X+ (D)	X (E)
	(B)	(B)	(B)
	(C)	(C)	(C)
Single/Massive	150 X− (A)	150 X− (A)	150 X− (A)	3 X+ (D)	X (E)
	(B)	(B)	(B)
	(C)	(C)	(C)
Multiple/Moderate	30 X− (A)	(A)	(A)	3 X+ (D)	X (E)
	(B)	30 X− (B)	(B)
	(C)	(C)	30 X− (C)
Multiple/Massive	150 X− (A)	(A)	(A)	3 X+ (D)	X (E)
	(B)	150 X− (B)	(B)
	(C)	(C)	150 X− (C)

Note: X was a 10-s click train. “+” denotes reinforcement with a mild footshock. “−” denotes no reinforcement. Letters in parenthesis indicate contexts. Context A, B, and C were counterbalanced. Numbers preceding letters indicate number of trials in that phase.