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. Author manuscript; available in PMC: 2007 Mar 5.
Published in final edited form as: Learn Behav. 2006 Feb;34(1):21–36. doi: 10.3758/bf03192868

Table 1.

Design of Experiment 1

Group Phase 1 Phase 2 Phase 3 Test
BB–Few 4 AX→O 20 A→O 4 O→US 1 X
Control–Few 4 AX→O 20 B→O 4 O→US 1 X
BB–Many 4 AX→O 200 A→O 4 O→US 1 X
Control–Many 4 AX→O 200 B→O 4 O→US 1 X

Note—BB, backward blocking; A and B, complex tone and white noise, counterbalanced; X, click train; O, flashing light; US, footshock. The numbers denote the number of presentations of each trial type in each phase.