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. 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 2.

Design summary of Experiment 2.

Groups Preexposure Acquisition Test
MassTrials/MassSessions 90 X− (A) 3 X+ (B) X (C)
6-s intertrial intervals
10-min intersession intervals
MassTrials/SpacSessions 90 X− (A) 3 X+ (B) X (C)
6-s intertrial intervals
7-d intersession intervals
SpacTrials/MassSessions 90 X− (A) 3 X+ (B) X (C)
600-s intertrial intervals
10-min intersession intervals
SpacTrials/SpacSessions 90 X− (A) 3 X+ (B) X (C)
600-s intertrial intervals
7-d intersession intervals

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