Researchers can now specify which variables can only be predictors (and not be predicted). This is necessary when a researcher wants to see how a variable that occurs outside the system influences variables inside the system. For instance, weather may predict self-reports of mood that occur across days, but mood will never predict the weather.

This option is essential for fMRI studies. Here, a task vector of onsets can be included. GIMME will convolve this vector using a smoothed FIR and include it in analysis. Researchers can indicate any interaction effects (e.g., the task times cerebellum activity across time) to include in the search procedure to see if relations among brain regions change during task.