Additionally, it has been suggested that those criteria relating
to high levels of engagement might be considered “peripheral” criteria for addiction
(cognitive salience, tolerance, and euphoria). That is, they can not be considered as
properties that identify addictive behaviour patterns, and are aspects of “normal” play.
Whereas, the remaining “addiction” criteria appear to be “core” criteria (conflict,
withdrawal symptoms, relapse and reinstatement, and salience). Studies using an
Addiction-Engagement questionnaire