Visual orientation and 3D Spatial Memory What makes orientation and navigation in 6 dof difficult? Body movements are unconstrained by gravity Inconsistencies in visual verticals of the various modules 3d configuration of modules and nodes is difficult to mentally image and rotate 16. 423 SBE(Neurovestibular Countermeasures)16.423 SBE (Neurovestibular Countermeasures) Visual Orientation and 3D Spatial Memory • What makes orientation and navigation in 6 dof difficult? – Body movements are unconstrained by gravity. – Inconsistencies in visual verticals of the various modules. – 3D configuration of modules and nodes is difficult to mentally image and rotate