Not much I can add on the cognitive symptoms apart from what has already been discussed. What I can add is touch sensitivity (remember the clothes sensitivity thread) and the effect that cognitive fatigue has on my physical capabilities. During a crash I lose all power and co-ordination. I am unable to walk at much more than a very slow shuffle, head bent, feels like I'm walking on sand, limbs feel heavy and joints sore and I develop a right leg limp. Prior to the crash I was usually fine, no problems walking, no muscle fatigue, little pain etc and the crash can be triggered by physical or mental overexertion. As the physical problems during a crash don't appear to be directly related to anything that would cause muscle fatigue etc, plus I've never sustained an injury that would explain the limp, I can only conclude that the gait problems are due to cognitive fatigue or a signalling problem.