Dear PLS experts,
I have a problem concernign the "out of bouds" message during datamat session files creation. I have checked for first subjects and the scans seem sufficient according to the FAQ and advices on the forum
.........
Q: When I generate fMRI datamat, I got something like this: Scans 147 for
the condition 3 of run1 are not included due to out of bound. Do you
have any idea what this means?
A: When you enter onset data, make sure they are in the range.
In most case, you encounter this problem because the onset
data you input exceeds the maximum range. The minmum value
is started from 0. However, The maximum value you can enter is:
Number_of_Scans - Temporal_Window_Size_if_fMRI - 1. E.g.: If you
have 180 files, and window size is 8, the maximum value in onset
data is 171.
..............
So, I have an event-related design, specifying a window size of 4 to check activation patterns of each trial. For the first subject, Matlab displayed this message : "Scans 1066 for the condition 4 of run1 are not included due to out of bound." So I have checked the subject folder and have 1072 files. So 1072-4-1 = 1067, but the last onset for this subject is 1066. Most of my subjects have an exclcusion of their last onset and I don't understand why or how to deal with that problem. Should I exclude these trials or reduce the temporal window ?
Thanks a lot in advance for your help,
Kind regards,
Marine
Dear PLS experts,
I have a problem concernign the "out of bouds" message during datamat session files creation. I have checked for first subjects and the scans seem sufficient according to the FAQ and advices on the forum
.........
Q: When I generate fMRI datamat, I got something like this: Scans 147 for
the condition 3 of run1 are not included due to out of bound. Do you
have any idea what this means?
A: When you enter onset data, make sure they are in the range.
In most case, you encounter this problem because the onset
data you input exceeds the maximum range. The minmum value
is started from 0. However, The maximum value you can enter is:
Number_of_Scans - Temporal_Window_Size_if_fMRI - 1. E.g.: If you
have 180 files, and window size is 8, the maximum value in onset
data is 171.
..............
So, I have an event-related design, specifying a window size of 4 to check activation patterns of each trial. For the first subject, Matlab displayed this message : "Scans 1066 for the condition 4 of run1 are not included due to out of bound." So I have checked the subject folder and have 1072 files. So 1072-4-1 = 1067, but the last onset for this subject is 1066. Most of my subjects have an exclcusion of their last onset and I don't understand why or how to deal with that problem. Should I exclude these trials or reduce the temporal window ?
Thanks a lot in advance for your help,
Kind regards,
Marine
Hi Marine - I wouldn't worry too much about it unless there are few trials for that condition. It amounts to one less trial that goes into the average for that task.
Dear Professor McIntosh,
Thank you very much for the very fast reply, I have many trials (maximum 32 and at least 20 according to subject's performance) for each of the 6 conditions, so I suppose that I can feel less stressed to continue my analyses :-)
Thanks again and have a nice day :-)
Marine
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