The term "core affect" was first used in print by Russell and Barrett in 1999 in Journal of Personality and Social Psychology where it is used to refer to the affective feelings that are part of every conscious state (as discussed by Wundt in his 1889 System der Philosophie).
In 1999, Russell and Barrett introduced the term "core affect" in the Journal of Personality and Social Psychology. They used it to describe emotional feelings that are inherent in every conscious state (as discussed by Wundt in his 1889 System der Philosophie).