Dear FSL expert:
Recently I tried to build custom parameter HRF using FLOBS, but there seem to be some errors.
I changed the range of m1, m2, m3 and m4 using Make FLOBS GUI and clicked Go, then output a folder named test.flobs and contains 5 files:
hrfsamps.txt
logfile
report.html
params.txt
hrfsamps.png
But the output file seems to be wrong because the hrfsamps.png only occupied 0 bytes.
Then I try to select the optimal/custom HRF convolution in FEAT and put the test.flobs directory in there, but show “invalid files”,and I put hrfsamps.txt in , then report an error:“Problem with processing the model: Warning: at least one EV is (close to) a linear combination of the others. You probably need to alter your design.(Design matrix is rank deficient-ratio of min :max) eigenvalues in SVD of matrix is 4.42991e-16). Contrasts involving these combinations will be set to zero. F-test 1 isn’t valid-each included contrast cannot be a linear combination of the others, child process exited abnormally.”
The same design never report error when using gamma HRF. I am very confused, which step is the problem?
Looking forward to receiving your reply, thank you very much!
Best wishes,
Zhaoxing
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