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(a) Behavioral procedure. Day 1 and day 2, habituation in context ‘a’. Day 3, conditioning in context “b” with an unpaired tone and foot shock. Day 4, testing first in context “a” with the tone (1 kHz/2 kHz/white noise, WN) and then testing in context “b” without the tone. (b) An increasing shock intensity progressively produced higher fear responses to the correct predictor of the threat. ** p < .01 compared with 0.6 mA, # p < .05 compared with 1.2 mA (n = 6–8 per group)
