Dear SPM experts,
In my design, I had two conditions (adoption of a field/observer perspective) that have been mixed with experimental blocks (i.e. participants stayed in the MRI but we had a short break in the middle of the experiment).
Thus, in one block they adopted one perspective, and in the other they adopted the other perspective (order was counterbalanced).
I am interested in how the condition influences the correlates associated with a continuous regressor, and wonder what I can and what I cannot analyse given the design I used to collect my data.
- I can look at the brain correlates of this regressor separately in each block (regressor)
- I can compare within each block negative and neutral trials separately for each condition (contrasts: negative > neutral or neutral > negative)
However, can I
- Compare together the regressors across the two blocks? And why?
- Compare together the results of the contrasts across the two blocks? And why?
PhD Student (KU Leuven)
Quantitative Psychology and Individual Differences
Tiensestraat 102 bus 3713
tel. +32 16 37 30 98