Dean plays various war games on his computer all the time, even when he has other things (e. g., work and studying) that need to be done. when dean is unable to perceive his behavior as self-destructive, which symptom of addiction is dean demonstrating

There are four symptoms of addiction namely:

Obsession
Negative consequences
Lack of control
Denial

In this patient, he denies that his behavior is self-destructive; even with the concrete evidence that he is being self-destructive (i.e. plays all day even with work to do). There are two descriptions of denial wherein; (1) he denies that what he does cannot be controlled and (2) he denies that what he does leaves a negative impact in his life. This patient falls to the latter description of denial.

I believe the symptom of addiction that Dean has is denial. a person who is in denial has lost touch with what is real(reality). They usually believe they are right and that they are the ones who know the truth. This this situation Dean is in denial of the fact that playing games has make him lose track of other things in his reality. this has made him to be unable to perceive his behavior is self destructive.