AFNI Message Board

History of AFNI updates  

|
June 01, 2022 02:12PM
Hello!

I'm trying to use trial-by-trial behavior as a parametric/amplitude modulator and look at contrasts where I compare the modulation effects between conditions.

I saw the following post: [afni.nimh.nih.gov] which suggests that I should be doing the following:

-gltsym 'SYM: myCondition1[1] -myCondition2[1]'

I just want to double check that I am conceptually understanding this correctly. If I were to do the following:
-gltsym 'SYM: +Ant.Mean -Ant.Nice' -glt_label 3 Ant.Mean.V.Nice

it would be equivalent to: -gltsym 'SYM: +Ant.Mean[0] -Ant.Nice[0]' -glt_label 3 Ant.Mean.V.Nice

and would NOT be actually capturing any of the amplitude modulation?

Whereas the following: -gltsym 'SYM: +Ant.Mean[1] -Ant.Nice[1]' -glt_label 3 Ant.Mean.V.Nice

Would be examining the difference in the modulation effect between the Mean and Nice conditions

Thank you!
Subject Author Posted

Amplitude Modulation GLT set up

MeganQ June 01, 2022 02:12PM

Re: Amplitude Modulation GLT set up

rick reynolds June 01, 2022 05:13PM

Re: Amplitude Modulation GLT set up

MeganQ June 02, 2022 08:58PM



Sorry, only registered users may post in this forum.

Click here to login