The example of Agnosia cited in the article indicates that there wouldn't be any degradation. Proprioception and physical interaction seem to have their own ded

The example of Agnosia cited in the article indicates that there wouldn't be any degradation. Proprioception and physical interaction seem to have their own dedicated pathway. If not being able to tell vertical from horizontal didn't affect the patient's ability to interact with the world, why would not being able to tell if a face is "happy" or "sad" have an impact?