The procedure of collecting the affective norms and the main findings are described in the article:
Warriner, A.B., Kuperman, V., & Brysbaert, M. (2013). Norms of valence, arousal, and dominance for 13,915 English lemmas. Behavior Research Methods, 45, 1191-1207.
You find the affective ratings here.
You find equivalent affective norms for the Dutch language here.
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