1) Kimberly Young began researching internet addiction in the 1990s when the term was first being used to describe those who spent large amounts of time online.
2) Studies in the late 1990s and 2000s linked the protein Delta FosB to addiction, finding it accumulated in the brain's reward system in response to both drugs and naturally rewarding behaviors like sex, gambling, and internet use.
3) The current method used to detect Delta FosB levels is the Western blot technique, but it has limitations including a high failure rate and inability to be used directly on living humans for treatment or prevention purposes.