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. Author manuscript; available in PMC: 2007 May 1.
Published in final edited form as: Learn Motiv. 2007 May;38(2):155–171. doi: 10.1016/j.lmot.2006.09.001

Table 2.

Design of Experiment 2

Group Preexposure Phase 1 Phase 2 Test X Test A
Acq-Con 2 A-, 2 X- 12 A2/12 US/12 A1 - 2 X1 → US X1 A1 or A2
PI-DiffA1 2 A-, 2 X- 12 A2 → US/12 A1 - 2 X1 → US X1 A1
PI-DiffA2 2 A-, 2 X- 12 A2 → US/12 A1 - 2 X1 → US X1 A2
PI-Same 2 A-, 2 X- 12 A1 → US/12 A2 - 2 X1 → US X1 A1

Note: The superscripts indicate the location of the CS (1 = Location 1 and 2 = Location 2). During preexposure each stimulus was presented from both Location 1 and Location 2. The numbers preceding the letters indicate the total number of presentations of the stimuli in that phase. Slashes separate unpaired presentations of CSs and USs. Stimuli A and X were a low frequency tone and white noise, respectively. → indicates “followed by.”