. 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 2.

Design summary of Experiment 2

Group	Phase 1 (Context 1)	Phase 2 (Context 1)	Phase 3 (Context 1)	Test Z (Context 2)	Test X (Context 2)
BB-Backward	6 US→AX	24 US→A	4 Z→X	Z?	X?
Ctrl-Backward	6 US→AX	24 US→ B	4 Z→X	Z?	X?
BB-Forward	6 AX→US	24 A→US	4 Z→X	Z?	X?
Ctrl-Forward	6 AX→US	24 B→US	4 Z→X	Z?	X?

Note: BB = backward blocking; Ctrl = control condition for backward blocking; Backward = CS-US pairing is conducted in backward temporal relationship in Phases 1 and 2; Forward = CS-US pairing is conducted in forward temporal relationship in Phases 1 and 2; “→” = pairing of stimuli with 5 s (Phases 1 and 2) or 7 s (in Phase 3) temporal gap. X = flashing light; Z = click train; A and B = high-frequency tone or white noise, counterbalanced; US = footshock. Numbers refer to the number of each trial type.