Figure 10. Mean (± SEM) percent freezing during extinction/testing for Experiment 2 shows that the occurrence of the stimuli at test disrupt freezing to the context and that the noise disrupts freezing to a greater extent than the tone (n=8 per group).

Also plotted is a similar curve showing freezing and the impact that shock presentation during training has on freezing. These data are averaged across both shock only groups (total n=16) on day 2 trials after fear to the context had been established, showing that shock disrupts freezing to an even greater extent than the noise. See Figure 10—source data 1.