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