Re: [Marsbar-users] mean signal intensity in ROI for parametric modulation

[Matthew B. <mat...@gm...>]

Hi,

On Sun, May 12, 2013 at 2:22 PM, durden10 <dur...@gm...> wrote:
>
> Dear Matthew, dear marsbar enthusiasts,
>
> pertaining to the below post, i was wondering if someone could further
> specify the correct procedure in order to extract an activation estimate
> from a parametric modulation.
> More specifically; I would like to analyse signal intensity (or signal
> change) in an ROI for events which have been assigned a parametric
> modulator. Since this is not possible on 1-level, I tried to do this with
> the 2-level data. I used the script from
> http://marsbar.sourceforge.net/faq.html#how-do-i-get-timecourses-from-images-in-an-spm-design,
> which seemed to work, although I am not sure if this is the right way to do
> it...
> Is there any other way I would be able to achieve this?

Could you give more detail about what you are trying to achieve?

I'm sure you know, but the parametric modulator gives an estimate for
how much the signal varies as a result of the parameter, after
removing the average activation across all events.  So extracting the
parametric modulator from the second level analyses gives you this
estimate, if that is what you want.

Cheers,

Matthew