Activation outside the brain

Hello!

I am doing an analysis using DPRSFA V_2.1 and Matlab 2015b.​ ​Unfortunately, when I complete the below-described analysis, ​I ​am getting​ ​significant ​activation outside of the brain​ (please see ​the picture in ​the ​attachment​)​. ​Would anyone know what could be the cause of th​is​? 

 

​To describe my analysis, ​I have data from two groups of subjects, acquired with different scanning parameters. One group: TR 2.3, vox size 3x3x3, second group TR 2.3 vox size 4x4x4.

 

Steps I did:

Preprocessing (separately for both groups):

Remove first 10 time points

Realignment

Coregistration

Segmentation (New Segment + DARTEL) 

Normalisation (by DARTEL; Voxel Size: 4x4x4)

Nuisance Covariates Regression (Rigid Body 6, method: CompCor)

Filtering 

Smoothing (6 6 6)

Functional Connectivity (with defined ROIs - spheres)

 

Second Level Analysis (for both groups together) - in SPM12. 

 

I would really appreciate any help in identifying the problem.

 

Best regards,

Emilia Cheladze