Dear SPM users,
First, thanks to Tony and James for their answer concerning an activation in an eye. It was really helpful. I'm now trying to apply a mask in my 1st level model. I've never done that.
I use the Batch Interface.
Based on the SPM manual ("A sensible option here is to use a segmentation of structural images to specify a within-brain mask.", p. 67), I choose an image of the segmentation step, the C1*, and put it as an explicit mask in the model specification (see
attachment script.png).
It's certainly not the way to go because almost all the significant activations within the brain are gone after masking (see attachment LeftWithMask.png).
Am I choosing the right image to do the masking (cf. C1* image)? Am I doing something else that is incorrect?
Any help will be greatly appreciated!
Regards,