Hello
I am currently doing an fMRI analysis and I am kind of new to this field. So my question may be basic but I would be truly grateful if you could clarify it for me.

I am using FSL to process some fMRI data. As I have 3 tasks, so I define 3 event files. Although I expect to have 3 columns in my design matrix, the analysis yields 6 columns. I wonder which columns should be considered in the design matrix. A screenshot of the resulting design matrix has been attached.
I would appreciate if you could clarify it for me.
Thank you for your time and consideration in advance.
All the best,
Fereshte