> unequal spacing of TENT functions would be invaluable for block designs since
> the onset period is of course much more important than the boring plateau phase....
> do you think this is on the todo list for afni?

You're the first person who has asked for such an option. If more people want this, we may consider it.

> I am trying your suggestion of splitting it up into separate trial types, do you think
> it is possible to concatenate the -iresp outputs?

You can use 3dTcat to glue the two outputs together. However, since the second response curve has a different time resolution, you would have to keep this in mind or artificially fill up the bigger gap before you view the final response curve.

> also great would be an option to force TENT to zero only on the onset (like the SIN
> model does, but there it cannot be turned off).

There are two ways to force the response to 0 at the onset: use TENTzero(0, c, n), or use TENT(b,c,n) but set 'b' to your time grid (for example, TR value). You can also manipulate the 'c' value in TENTzero or TENT so that the response curve ends at the time point you want. Also the tent function does go back to zero because it has to be anchored on the ground. In other words, when you set the last TENT at 'c', the response would presumably go back to zero at the next time point after 'c'.

Gang



Edited 1 time(s). Last edit at 08/09/2013 11:49AM by Gang.