I've gotten a lot of silly downvotes. My research into the answers is proven and the conclusions I give are logical.
For this question no one in their right mind would think that the fine motor skills used by handwriting mystically impart a greater understanding of the source material. I found two papers which prove as much. One gave a small advantage to handwriting and the other gave an equally small penalty for handwriting. Yet I have a -3 and counting?
This question likewise has a -3 when it is also well researched and explains a stress based theory of mental illness. Likewise no honest scientist would stretch the diathesis-stress model to the extreme to say that resilient individuals could survive many catastrophes and still be left unmarked. Many examples of resilient people though not psychopathic are psychologically scarred and traumatized.
Its rather basic really. Neurological factors influenced by many things including age play an important role in the acquisition of language. No one thinks a demented 90 year old is going to learn a new language through immersion.