The psychologists offered two preliminary explanations:

• "First of all, computer involvement is inline with typical gender stereotypes. Boys show behavior that conforms to these stereotypes.
• Secondly, among all searched media, the computer is the only really interactive medium. If interactivity of a medium is a central feature that allows a relevant impact of a certain medium on well-being, then it is understandable why only the computer, but no other medium showed an impact on changes in the well-being of adolescents.

This interpretation gains plausibility when we report a central finding from our more detailed look at the impact of the radio on developmental pressure. There we were able to show that adolescents benefited from radio use (in the form of a reduction  of developmental pressure) most strongly, when they particularly appreciated the parasocial contact they could gain through radio use. Parasocial contact, i.e., briefly stated, imagined interaction with radio actors, might be seen as a rudimentary form of interactivity.
 
So seemingly interactivity of a medium could be at the core of a mediums impact on well-being. This could be the case, because interactivity allows one to externalize something like psychosomatic symptoms."

Neue Medien im Alltag: Befunde aus den Bereichen Arbeit, Lernen und Freizeit
Schütz, A.; Habscheid, S.; Holly, W.; Krems, J.; Voß, G.G. (Hrsg.)