I am working on a dataset for an NLP task connected with sentiment analysis. While thinking on word roles in composing of the overall sentiment and marking particular as being positive/negative, we came across to three different situations:
word is considered generally positive: food, sleep, health, chocolate, help, politeness, etc;
word has an appraisal role: respectful, beneficial, responsible, objective (adj.), strong, useful;
word is emotionally charged: unforgettable, to admire, happy, magnificent, impressive.
Are there papers and/or research on the subject? I am looking for a formalized differentiation between those classes of positive/negative words.