Figure 3.

Illustration of the block-design fear acquisition and fear extinction task. In the first block, children are presented with a set of 10 CS- trials of the above duration, followed by 10 US trials, 10 CS+ trials, and ITI of the same duration. In 8/10 US trials, children hear a loud aversive sound. Following the first block, block order is randomized for each set of trials (CS-, US, CS+, ITI). Children are presented with four blocks of each trial type in fear acquisition. In fear extinction, children are presented with four blocks of three trial types (CS-, CS+, ITI).