 , ""  .  ,   10%     ,  
    
    .          .        . 
   ?         ,              -          ,     ,   .  .     ,     Journal of General Psychology,   -
       Muhlenberg College (, ) ,        
 10%  4000 ,   - .      :     (Harry Potter
and the End of the Line: Parallels with Addiction )   ,    ,       .      ,     .  ,  10%    ,   4     ,   ,      ,   ,    .       .      
,   ,           ,    .