Passionate love feelings are most commonly measured by psychologists with a
questionnaire called the
Passionate Love Scale (PLS). Passionate love is linked to
passion, as in intense
emotion, for example, joy and fulfillment, but also anguish and agony. Hatfield notes that the original meaning of passion "
was agony—as in
Christ's passion." Passionate love is said to usually only be present (or the most intense) in the early stage of love, when a relationship is new or before a relationship has started. In contemporary literature, the original characteristics of passionate love are seen to some degree as being a mixture of things. For example, it's been determined that the PLS has questions which measure companionate love, which led
Sandra Langeslag and colleagues to develop the
Infatuation and Attachment Scales (IAS) as a newer measure of passionate and companionate love. Finally, while Elaine Hatfield originally described passionate love as having a component of sexual attraction,
Infatuation Langeslag et al.'s
Infatuation Scale (analogous to passionate love) has items asking about:
Albert Ellis and Robert Harper conducted interviews and concluded that the only difference is that people use the word "infatuation" in hindsight to refer to a relationship after it ends and "love" to refer to a relationship still in progress. Hatfield suggests that when parents and friends say somebody is "just infatuated" they're just saying they don't approve of the relationship.
Obsession Passionate love is described as having an obsessional element characterized by intrusive thinking, uncertainty, and mood swings. Studies by
Bianca Acevedo &
Arthur Aron found that the obsessional component of the PLS can be separated from the non-obsessional component. These authors (Acevedo & Aron, Graham) have speculated that continued romantic obsession within a relationship could be connected to
attachment style. Attachment style refers to differences in attachment-related thoughts and behaviors, especially relating to the concept of security vs. insecurity. People can also have different attachment styles with different partners, for example an avoidant partner can cause a secure partner to feel and act anxious. A brain scan experiment also found that couples who were still in love after four years (as compared to those who weren't) showed activation in a region associated with suspending negative judgment and over-evaluating a partner. While
Elaine Hatfield and others have traditionally associated idealization with passionate love, studies on positive illusions have looked at couples in varied stages of their relationships, including long-term couples. == Companionate love ==