In the ongoing debate over the structure of emotions, Barrett and Russell (1998) proposed that misery-pleasure and arousal-sleep represented two:

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Barrett and Russell (1998) proposed that misery-pleasure and arousal-sleep represent two uncorrelated dimensions of emotion, which is a perspective that contrasts with theories positing discrete categories of emotion. This dimensional approach suggests that emotions can be described in terms of their position within a continuous space defined by these dimensions, rather than being entirely separate categories.

In the Ongoing Debate Over the Structure of Emotions, Barrett