Mason has been diagnosed with autism spectrum disorder. when others around him yawn, he does not yawn. when asked to imitate someone's facial expression, he cannot and does not experience a similar emotion. this difficulty in imitating has been attributed to:

I believe the answer is: the brain's inability to mirror observed activities.

This type of condition would make a person to face a really hard problem in handling social interraction and social communication. Currently, there is no known cure for Autism Spectrum Disorder and the condition would occur for the rest of the victim's life.