sometimes you get confused about how to interprate the result from the mri imaging in case on EEG data
what is left and what’s right, smartly, most of software give a mark to show your right or left.
I think feildtrip should improve on this area to make figures smoothly and clearly .

if you use ft_sourceplot you have lots of selections however when you get the picture you did not see anything indication of the direction.

how to decide the direction in feildtrip? they give a brief about this as following :

If the transformation matrix is describing the transformation from voxel space to a world coordinate system where the XYZ-axes are described with right-handed coordinate axes, AND the transformation matrix is also right-handed, then 'right is right, and left is left'.

If the transformation matrix is describing the transformation from voxel space to a world coordinate system where the XYZ-axes are described with right-handed coordinate axes, AND the transformation matrix is left-handed, then 'right is left, and left is right', and equivalently 'the image is flipped'.
This leaves the question how to determine the handedness of the transformation matrix. This can be determined from the determinant of the upper-left part of this matrix. When

det(X.transform(1:3,1:3))
has a positive value, the transformation-matrix is right-handed, otherwise it's left-handed. Alternatively, you can also explore the data in ft_sourceplot (using cfg.method='interactive') and start clicking around on positions on the left/right axis. Pay special attention to what is happening with the real world coordinate that is describing the left/right axis. This should give you a clue as to what is left and what is right in the image.