Milner and Goodale put together a theory of what’s going on – in us, as well as in special cases like DF’s. They argue that there are two “streams” by which visual information moves through the brain. The ventral stream, which takes a lower path through the brain, is concerned with categorization, recognition, and description of objects. The dorsal stream, which runs above it, closer to the top of the head, is concerned with real-time navigation through space (avoiding obstacles as you walk, getting the letter through the slot). Milner and Goodale argue that our subjective experience of
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