A 52-year-old male patient returned to work despite serious memory disorder caused by herpes encephalitis

Most individuals with herpesviral encephalitis show a decrease in their level of consciousness and an altered mental state presenting as confusion, and changes in personality.But there is a  52-year-old male , who had suffered from severe impairment in recent memory due to sequelae of herpes encephalitis, for 20 years. He returned to his highly intellectual work and performed well despite his doctor’s prediction.However, the patient showed consistently poor results on various neuropsychological memory tests, he only demonstrated incredible performance at work. 

This is rare to see. Why happened?Does it related with some kind of brain activity?Recommend an article from Scientific Research Publishing to you . The article studied this phenomenon.