This late-in-life acquisition came as a great surprise to Dr. Barry, who as a professor of neurobiology had long taught her students that there are "critical periods" for developing such capabilities, and if you don't get them then, you never will.
As a lover of stereo, and an optimist about neuroplasticity, I find Dr. Barry's account of her experience to be fascinating on many levels.
If any of this interests you, then I suggest to visit http://www.stereosue.com/ and follow the links in the first paragraph.
The article at newyorker.com is an excellent place to start. Despite lots of reading about stereoscopy over the past several decades, much of the material in the article was new to me.Dubbed “Stereo Sue” by neurologist Oliver Sacks in a New Yorker article by that name, Sue Barry has gone on to write her own book Fixing My Gaze which describes the astonishing experience of gaining 3D stereovision after a lifetime of seeing in only two dimensions. Intensive vision therapy created new neural connections, and with them, a new view of the world. Challenging conventional wisdom that the brain is programmed for life during a critical period in childhood, Barry offers a poignant and revelatory account of our capacity for change.
I have read the book also, once through from start to end, and I'm currently starting my second pass.