Supplementary Figure 4: Effect of repeated USs depends on contingencies.
From: Evaluation of ambiguous associations in the amygdala by learning the structure of the environment
(a) Behavioral data (left) and model simulation (right) for conditioning with 15, and 21 CS-US pairings (n=9, 7). Adding further shocks paired with the same tone CS (21 pairings in total) did not reduce tone memory strength. (b) Behavioral data (left) and model simulation (right) for the cover stimulus effect. Signaling shocks with a second CS (in this case a flashing light), instead of giving unsignaled shocks attenuates contingency degradation (comparison between Pairings First and Cover Stimulus groups, n = 18, 12, unpaired sample t-test, t28 = 2.42, * P = 0.022) Error bars indicate s.e.m.
