GrahamH wrote:I suspect they might having something a little like blindsight of the other's eyes. One video showed one reaching for an object only in the other's line of sight. It looked very uncoordinated, like groping in a direction that might be using a general sense of location rather than a clear view.
This might make sense given the connection is in thalamus.There is evidence[8] that the twins' can see through each other's eyes due to brain conjoining. Their thalamuses are joined.
http://en.wikipedia.org/wiki/Krista_and_Tatiana_HoganTo put it in a more complex way, recent physiological findings suggest that visual processing takes place along several independent, parallel pathways. One system processes information about shape, one about color, and one about movement, location and spatial organization. This information moves through an area of the brain called the lateral geniculate nucleus, located in the thalamus, and on to be processed in the primary visual cortex, area V1 (also known as the striate cortex because of its striped appearance). People with damage to V1 report no conscious vision, no visual imagery, and no visual images in their dreams. However, some of these people still experience the blindsight phenomenon. (Kalat, 2009)
http://en.wikipedia.org/wiki/Blindsight ... s_involved
It isn't blindsight - each girl can actually SEE through the eyes of the other! That's actual sight, not blindsight. There's a neural pathway from one brain to the other, that enables it. They are thought to be unique in the world for that.
A more sensible point is how are the two fields of view merged?