help > RE: Pre-Post with multiple contrasts
Jan 14, 2020  09:01 AM | Alfonso Nieto-Castanon - Boston University
RE: Pre-Post with multiple contrasts
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:
Let's say I have the following conditions:
visual
auditory
pre
post
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

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TitleAuthorDate
John Johnson Jan 14, 2020
RE: Pre-Post with multiple contrasts
Alfonso Nieto-Castanon Jan 14, 2020
John Johnson Jan 15, 2020