I need to convert my nifti file antinsula_lr_resampleafni+tlrc.nii.gz into a BRIK.gz file and a HEAD file. When I attempt the command 3dcopy antinsula_lr_resampleafni+tlrc.nii.gz antinsula_lr_resampleafni it says FATAL ERROR: No datasets found
That looks like a "design flaw" for NIFTI datasets that contain the "+tlrc" or "+orig" inside them. You can work around this by either moving/renaming the file to one without the offending characters first or by using another command like 3dcalc to copy the dataset:
3dcalc -a antinsula_lr_resampleafni+tlrc.nii.gz -expr a -prefix antinsula_lr_resampleafni
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