"That this phenomenon occurs in animals was demonstrated conclusively in an experiment performed by Colin Blakemore and Grahame Cooper at the University of Cambridge and published in 1970. They raised kittens in pitch darkness, except for 5 hours each day during which they were put in pens painted with either vertical or horizontal stripes. After five months, the kittens were let loose in a normally lit room. Those that had been exposed only to horizontal lines would repeatedly walk into table legs, while animals exposed to vertical lines couldn't see horizontal edges. Each was effectively blind to edges in the direction they had not been exposed to during the formative period."
I just didn't want to forget this insight into neural development.