Before revision: It can have three different causes: a low level of attention ("blanking" or "zoning out") intense attention to a single object of focus (hyperfocus) that makes a person oblivious to events around him or her ; unwarranted distraction of attention from the object of focus by irrelevant thoughts or environmental events.
After revision: It can have three different causes: a low level of attention ("blanking" or "zoning out") intense attention to a single object of focus (hyperfocus) that makes a person oblivious to events around them ; unwarranted distraction of attention from the object of focus by irrelevant thoughts or environmental events.