Before revision:  Meanwhile, an intriguing question about the brain is why  entire neocortex shares a canonical six-layer architecture , while its posterior and anterior halves are engaged in sensory processing and motor control, respectively.
After revision:  Meanwhile, an intriguing question about the brain is why the entire neocortex shares a canonical six-layer architecture , while its posterior and anterior halves are engaged in sensory processing and motor control, respectively.