hello experts

i am using conn for functional connectivity 

in my data i have two conditions and i want check  connectivity for each condition 

here i have attached error file please provide suggestion how can i remove this error . 

help would be highly appreciated .

Hello Diksha,

The error specifies that your condition "onset times" extend beyond the end of your actual functional scanning session. The end of your scanning session is determined by the number of functional scans that you have entered in Setup.Functionals (for each subject/session) and the data acquisition TR (in Setup.Basic), and the "onset times" for each condition are defined in the Setup.Conditions tab and they represent the beginning (in seconds) of each condition block within your scanning session. 

This error could then be due to:

 a) incorrectly specifying your acquisition TR (perhaps you entered a TR value that is smaller than it should be, so the "scan number"-to-"scan time" transformation is incorrectly defined)

 b) incorrectly specifying the condition onsets (perhaps there is some typo in the specified onsets and some of those values are just too high; check in Setup.Conditions that your onset times, in seconds, correctly specify the beginning of each condition block for each subject/session)

or c) incorrectly entering your functional data (perhaps you entered in Setup.Functional less scans than your full scanning session; check in Setup.Functional that the number of files reported for each subject/session matches the expected length -number of acquisitions- of your scanning session; even if you entered a single 4d functional file you should see above the functional data image a small text that reads something like "### files with [#,#,#] dimensions")

Let me know if any of these seems to be the case here, and/or if you would like me to further clarify any of the above.

Best
Alfonso

Originally posted by diksha rathore:

Dear Alfsono ,

 thank you making response 


  i have  got data  through online  website .  and for each condition  in every subject there is  given infromation onsets  
and given TR time is 2 sec  total volumes  are 160 .  at  preprocessing time i  have deleted first four volumes and  simply put  given onsets(without any change) at each condition.

so is it correct way or  it needs some corrections
please find attached on sets text files .

awaiting to hear you back.


thank you in advance
diksha

Dear Diksha,

Your last onset time is at 317.51seconds. Since you removed the first 4 scans, your functional series is 312 seconds long (156 scans, 2 second tr), hence the error message (onsets extend beyond the end of the scanning session, i.e. 317.51>312). You simply need to subtract 8 from all of your onset times in order to account for the 4 removed scans.

Hope this helps
Alfonso
Originally posted by diksha rathore:

Dear alfonso ,


thank you so much . it is great help