In this case, the team used a variant called ipsilesional anodal tDCS, where a positive (anodal) current is
applied on the side of the brain where damage has occurred.
Faced with a portal
on either
side and both
brains being restricted by enemies (imagine the cone shapes that represent the enemies in the Metal Gear Solid mini map), I only had one option
of movement, it wasn't until exhausting what I thought were all my options that I realised not only could I move between both
sides, but I could
apply the items available to me in a similar way.