Let's say I have the following conditions:



and I would like to compare "visual (pre)" to "visual (post)", and then "auditory (pre)" to "auditory (post)".
In other words, the effect of an intervention on each of the conditions.
What would be the appropriate "Between-conditions contrast" to use?

Thanks

Hi John,

For that you would need to have created four conditions: pre-visual (those scans associated with the visual task pre-intervention), pre-auditory (those scans associated with the auditory task pre-intervention), post-visual, and post-auditory. Then you would:

1) select pre-visual and post-visual conditions and enter a [-1 1] contrast to look at the effect of intervention in the visual scans
2) select pre-auditory and post-auditory conditions and enter a [-1 1] contrast to look at the effect of intervention in the auditory scans
3) select pre-visual, pre-auditory, post-visual, post-auditory conditions and enter a [-1 1 1 -1] contrast to look at the interaction between task and intervention

Hope this helps
Alfonso

Originally posted by John Johnson:

Very helpful. Thanks Alfonso!