My interpretation of your answers leaves me to conclude then, that there is a lot of conflicting research on this, as thought out to be. I am glad from hearing though, that impairments only can arise during stress. So I guess during exams and stuff, it could have a noticeable effect? For example I notice that if I study intensely for a day, my head gets extremely hot for some reason, not really sure if this is a normal reaction to stress, or PCS.