Hello,

I'm running an amplitude modulated deconvolution using 3dDeconvolve, with TENT as the basis function. I've specified a 20 second window with 1 second radius (my TRs are 1 sec). The relevant part of the script for this looks like:

-stim_times_AM2 1 timing_file.1D 'TENT(0,20,20)' -stim_label 1 variable_name \

In my timing file, each stimulus is listed like this:

start_time_of_stimulus*modulator1,modulator2,modulator3:duration_of_stimulus (e.g., 5*2.1,4.3,3.8:1.2)

The output for each variable contains 100 beta weights. I'm seeking confirmation on my interpretation of these coefficients please. Here's how I'm interpreting them based on the documentation:

0 -19: unmodulated (mean) response that depends upon the stimulus duration, at each of the TENT functions
20 - 39: response modulated by modulator1, at each of the TENTs
40 - 59: response modulated by modulator2, at each of the TENTs
60 - 79: response modulated by modulator3, at each of the TENTs
80 - 99: This is the one I'm unsure about. I thought it might be the response modulated by duration, but my understanding is that the first set of coefficients incorporates the duration. Can you please offer guidance about this last set of beta weights, or whether the first set does not incorporate duration? Thank you.