(see online Supplementary Material for the detailed statistical model description).
The effects included in each model were estimated simultaneously using the SAS procedure MIXED.24,48 Although the
models include specific regression coefficients for each of the movement types (CS1 and CS), based on our
theoretical framework as well as the visual inspection of Fig 2, it is expected that the differences during extinction
learning will be related to the CS rather than to the CS1. Follow-up contrasts were calculated to test our a priori hypotheses