Those are the sig maps for the real and imaginary components. If you want one sig that combines both, use the fsig (which is an F-test of the real and imag). dogu

On 06/05/2013 05:46 PM, dgw wrote:

Hi,

I am examining the difference in significance between different scan parameters in a retinotopy experiment and analysis. I have loaded the sig.nii.gz file in matlab using MRIread, and I am confused by the dimensions of the "volume". I understand that this is a surface based file, but the dimensions of my sig file from the eccen subfolder are: 1 148498 1 2

Obviously the ones are not a problem and the 148498 refers to the number of vertices in that hemisphere. What does the 2 mean? What is that second component? (note this is using 5.1.0).

Thanks, Dan

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