not sure what you are trying to do. can you send a picture? the default lag is TR/2

On 3/29/18 2:30 PM, Sarah Cole wrote:
Thanks, Doug.

I added (-4s) delay and plotted the data but I got the same delay as no shift. Also I did (+4) delay and lost most of the activation.

Do you have any recommendations?

Thanks,
Sarah

On Wed, Mar 28, 2018 at 4:39 PM, Douglas N. Greve <dgr...@mgh.harvard.edu <mailto:dgr...@mgh.harvard.edu>> wrote:

    You can use the -delay flag in mkanalysis-sess

    doug


    On 03/28/2018 05:35 PM, Sarah Cole wrote:
    > Hi Doug,
    >
    > I have a block design experiment. After analyzing the data and
    > plotting the response magnitude across the TRs, we see that
    there is a
    > systematic lag in the response. For example, in a 16s block (TR=2s),
    > at TR-1 and TR-2 the response goes down and then starts rising from
    > TR-3. This is consistent across the subjects and blocks.
    >
    > We used to shift our raw data by 2 TRs when we were using SPM.
    >
    > How can we do this in FreeSurfer?
    >
    > Thank you,
    >
    > Sarah
    >
    >
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