> can I do a Session X Condition interaction within 3dDeconvolve?

Sure! Many ways to set the interaction test, and one approach is the following with 9 rows in -gltsym:

1*Session1Condition1 - 1*Session1Condition2 -1*Session2Condition1 + 1*Session2Condition2 \
1*Session1Condition1 - 1*Session1Condition3 -1*Session2Condition1 + 1*Session2Condition3 \
1*Session1Condition1 - 1*Session1Condition4 -1*Session2Condition1 + 1*Session2Condition4 \
1*Session1Condition1 - 1*Session1Condition2 -1*Session3Condition1 + 1*Session3Condition2 \
1*Session1Condition1 - 1*Session1Condition3 -1*Session3Condition1 + 1*Session3Condition3 \
1*Session1Condition1 - 1*Session1Condition4 -1*Session3Condition1 + 1*Session3Condition4 \
1*Session1Condition1 - 1*Session1Condition2 -1*Session4Condition1 + 1*Session4Condition2 \
1*Session1Condition1 - 1*Session1Condition3 -1*Session4Condition1 + 1*Session4Condition3 \
1*Session1Condition1 - 1*Session1Condition4 -1*Session4Condition1 + 1*Session4Condition4 \

You will get in the output 9 individual t-tests (each corresponds to one row above) plus an F-stat. The F-stat is what you're looking for, which shows the interaction effect between session and condition.

Gang



Edited 1 time(s). Last edit at 07/15/2013 12:40PM by Gang.