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. Author manuscript; available in PMC: 2010 Apr 15.
Published in final edited form as: J Exp Psychol Anim Behav Process. 2010 Apr;36(2):281–295. doi: 10.1037/a0016773

Table 3.

Design summary of Experiment 3

Group Phase 1 (Context 1) Phase 2 (Context 2) Phase 3 (Context 2) Test X (Context 1)
BB-Extinction 4 AX-US 108 X- 24 A-US X?
Ctrl-Extinction 4 AX-US 108 X- 24 B-US X?
BB-No Extinction 4AX-US - 24 A-US X?
Ctrl-No Extinction 4 AX-US - 24 B-US X?
OV-Extinction 4 AX-US 108 X- - X?

Note: BB = backward blocking; Ctrl = control condition for backward blocking; OV = overshadowing control for backward blocking; Extinction = X is extinguished during Phase 2; No Extinction = no X exposure during Phase 2; US = footshock; “-“ = no presentation of the US. X = click train; A and B = high-frequency tone or white noise, counterbalanced. Numbers refer to the number of each trial type.