Symmetry between linear pathways on either side

Symmetry between linear pathways on either side 

It has been found that there is a strong correlation between the length of the linear pathways of the tasks xNNr and xNNl. Which conclusions can be drawn from this fact about the route of these two pathways.  

Either the two pathways, xNNr and xNNl, run on the same side of the brain or there must be one reason which is responsible for the selection of the length of the linear pathways on both sides. That means it determines both linear pathways without any place for random determination. 

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