As a result to the damage to the temporal lobe region that is needed to recognize faces, a condition known as prosopagnosia will occur.
It is a condition where one is said to have face blindness which means that they are unable to recognize the faces of people.
Even though this usually occurs from birth, it can also happen when people like John sustain damage to a part of the temporal lobe that helps in face recognition.
In conclusion, this is prosopagnosia.
Find out more on the temporal lobe at https://brainly.com/question/7898820.