I quote others because there are so many that know more about the subject than me.
Oliver Sachs says, when speaking of a subject that was deft and had never been exposed to sign language. "Joseph saw, distinguished, categorized and used objects. He had no problem with perceptual categorization or generalization, but he could not, it seemed go much beyond this, hold abstract ideas in his mind, reflect, play or plan. He seemed completely literal, unable to juggle images or hypothesis or possibilities. Unable to enter the imaginative or figurative realm. He seemed like an animal or an infant to be stuck in the present".
Oliver Sachs says, when speaking of a subject that was deft and had never been exposed to sign language. "Joseph saw, distinguished, categorized and used objects. He had no problem with perceptual categorization or generalization, but he could not, it seemed go much beyond this, hold abstract ideas in his mind, reflect, play or plan. He seemed completely literal, unable to juggle images or hypothesis or possibilities. Unable to enter the imaginative or figurative realm. He seemed like an animal or an infant to be stuck in the present".
