AFNI Message Board

History of AFNI updates  

April 19, 2022 10:26AM

Your interpretation seems correct.

Note that TENT(0,20,20) will not be TR-locked. You probably want TENT(0,20,21), and Gang would suggest using TENT(1,19,19), to omit time points for which you expect the betas to be zero.

The 20-second interval from 0 20 needs 21 betas to include the end points, measured at times 0..20 (so 21).

As you thought, the duration modulation part of the stimulus is indeed being treated as amplitude modulation, because it is not possible to use DM with TENTs. Doing so would mean either spacing the 21 knots at varying time points or using a variable number of knots, either of which would alter the interpretation of the betas across events. The program does not give a warning or error, because it has a liberal interpretation of the punctuation, applying as "seems appropriate".

- rick
Subject Author Posted

AM2 TENT Deconvolution Output

AMReye April 18, 2022 04:06PM

Re: AM2 TENT Deconvolution Output

rick reynolds April 19, 2022 10:26AM

Re: AM2 TENT Deconvolution Output

AMReye May 03, 2022 12:35PM

Re: AM2 TENT Deconvolution Output

rick reynolds May 03, 2022 01:39PM

Sorry, only registered users may post in this forum.

Click here to login