Malcolm Myatt he suffered a stroke when he reached 68 years old
this stroke put him in a coma for 19 weeks until he completely recovered
Unfortunately, the stroke caused a defect in the frontal lobe of his brain
It made him lose the ability to sense, depression and sadness !!
it made him feel only happy !!
source : https://www.telegraph.co.uk/news/health/news/10237796/Stroke-victim-unable-to-feel-sadness.html