Second, valence is by no means a straightforward characteristic of emotions. Feldman Barrett, for example, in a recent study found that First, the desirability of a mood and the hedonic quality [valence] of a mood are related, but not identical entities. Secondly, the desirability of a mood is also related to the level of arousal the mood denotes. Thirdly, desirability components are related to the self-report ratings of mood, but the ratings also reflect the hedonic tone and level of arousal describing the internal state of the respondents. (1996:47