Phillips, F., O’Donnell, E. & Kernis, N. Visual and haptic geometry of 3D shape discrimination. Journal of Vision 15, 866–866 (2015). PDF
Some preliminary work on ‘where you look when you’re trying to discriminate 3D objects.’
Turns out, it’s different, depending on if you’re trying to match two visual objects than it is if you’re matching a visual object to a haptic object. This is true for both ‘local’ behavior (e.g., what you’re looking at) and ‘global’ behavior (e.g., how you look at the objects).