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. Author manuscript; available in PMC: 2007 Feb 8.
Published in final edited form as: J Exp Psychol Anim Behav Process. 2006 Oct;32(4):396–406. doi: 10.1037/0097-7403.32.4.396

Table 2.

Design of Experiment 2

Group Phase 1, Blocking A, 3 days Phase 2, Blocking B, 3 days Phase 3, retention interval Phase 4, extinction Test
Short–Ext A 12A+/3AX+ 12B+/3BX+ 1 day 400 A− X
Short–Ext B 12A+/3AX+ 12B+/3BX+ 1 day 400 B− X
Short–No Ext 12A+/3AX+ 12B+/3BX+ 1 day Context X
Long–Ext A 12A+/3AX+ 12B+/3BX+ 22 days 400 A− X
Long–Ext B 12A+/3AX+ 12B+/3BX+ 22 days 400 B− X
Long–No Ext 12A+/3AX+ 12B+/3BX+ 22 days Context X

Note. A and B = competing stimuli; X = target cue; + = footshock; Short = 1-day retention interval; Long = 22-day retention interval; Ext = extinction. Numbers next to the stimuli indicate the total number of trials or days in that phase. Slashes indicate interspersed trials.