Happiness is pleasant, or is it? Implicit representations of affect valence are associated with contrahedonic motivation and mixed affect in daily life
Emotion (2014) - Comment
pubmed: 25151515  doi: 10.1037/a0037711  issn: 1931-1516  issn: 1528-3542 

Michaela Riediger, Cornelia Wrzus, Gert G. Wagner