Hi Jessica,

In general red indicates that your contrast effect is positive and blue indicates that your contrast effect is negative. In your case if you selected in the conditions list "Baseline" and "Post" and entered a [1 -1] between-conditions contrast, then your contrast effect is computing Baseline*1 + Post*(-1) = Baseline-Post. Results shown in red indicate that this contrast effect is positive, so Baseline-Post>0, which means that Baseline>Post, while results shown in blue indicate that this contrast effect negative, so Baseline-Post<0, which means that Baseline<Post.

That said, you typically will want to plot in each cluster of your results the connectivity values in Baseline and in Post conditions, because the above information does not tell you the above story (e.g. if Baseline>Post that could indicate a positive strong connectivity in Baseline that decreases its strength in Post, but it could also indicate a zero connectivity in Baseline that becomes an anticorrelation in Post). Using the 'plot effects' button in the results explorer allows you to easily display those individual connectivity values within each of the areas/connections in your group-analysis results. 

Hope this helps

Alfonso

Originally posted by Jessica Schachtner:

Hello, 

I have a study wherein one group completed an intervention, with pre and post MRI data. I contrasted the data as "Baseline > post" (1, -1). I have received differential information of how to interpret the results. 

Specifically, I am confused about whether, for example, blue would indicate an overall decrease from baseline to post, or if blue indicates that connectivity was less at baseline than at post (increase over time). Then for red, if this means there is increased connectivity after the intervention, or if connectivity was greater at baseline than post (decrease over time). 

Thanks.