It has long been believed that passionate love wanes over time, whereas companionate love grows stronger with time. Using a sample of individuals in dating relationships who reported on their feelings of love for their partners up to 20 times over the course of several months, I tested whether passionate love and companionate love develop across the early months of romantic involvement in a manner consistent with theory. Additionally, I investigated whether certain developmental trajectories of both varieties of love are more predictive of relationship dissolution than others. To do this, I first examined the average trajectories of passionate and companionate love for those who stayed together with their partners and those who experienced a breakup, paying special attention to extraneous factors that were expected to influence the manner in which both varieties of love changed over time. The amount of time individuals knew their partners prior to becoming romantically involved, their feelings of the opposing variety of love, the extent to which individuals wanted to break up with their partners, their perceptions of their partners’ desire to break up, and gender all informed the ways in which love changed over time. Because it was expected that passionate love and companionate love would show substantial heterogeneity in their temporal trajectories, I then identified the prototypical patterns of development for passionate and companionate love. The results for passionate love revealed eight distinct linear trajectories, and six unique linear trajectories were identified for companionate love. For passionate love, individuals who experienced stable or declining levels of love were more likely to experience a breakup, but the connection between companionate love and relationship dissolution was less straightforward. Perhaps most importantly, passionate and companionate love interacted to predict the likelihood of dissolution, such that, to the extent that individuals who reported higher levels of passionate love also reported stronger feelings of companionate love, the lower their odds of dissolution. The current findings both complement and extend prior theoretical and empirical work on the developmental trajectories of passionate and companionate love and their connections to relationship dissolution. / text

Le but principal de cette thèse est d'explorer le sentiment d'amour passionnel dans les relations romantiques. L'amour passionnel est définit comme « un état de désir intense à d'union avec un autre ». Ce construit est généralement considéré comme une expérience universelle fortement associée à l'attraction sexuelle et possédant un impact considérable sur les dimensions émotionnelles, cognitives et comportementales. Le but principal de cette thèse était d'apporter de nouveaux éléments montrant que les expériences subjectives de l'amour passionnel sont culturellement et contextuellement déterminées et qu'il existe néanmoins une certaine universalité des cognitions et comportements lorsque les personnes déclarent être amoureuses. De plus, nous avons étudié l'effet de l'amour passionnel sur les processus cognitifs. Au total, 1000 étudiants ont participé à 4 études différentes. Des sujets français et brésiliens ont répondu à l’Échelle d'Amour Passionnel (PLS) dans le but d'étudier leurs sentiments d'amour passionnel sur la base des composantes cognitive, émotionnelle et comportementale. Les représentations sociales de l'amour passionnel de ces mêmes groupes ont été explorées à partir d'analyses structurelles d'associations de mots. Les processus cognitifs de l'amour passionnel ont été testés dans une étude sur la relation entre l'amour passionnel et les expériences sensorielles et une étude sur l'effet de l'amour passionnel sur les productions créatives. Les résultats obtenus avec la PLS ont montré les mêmes propriétés psychométriques en France et au Brésil. Dans les deux cas, l'analyse factorielle a révélé une composante principale avec des consistances internes élevées. Les sujets qui ont déclaré être amoureux ont semblé aimer avec le même niveau de passion dans les deux cultures mais des différences de genre ont été retrouvées au Brésil. L'analyse des associations de mots a indiqué des différences contextuelles, culturelles et de genre. En ce qui concerne les processus cognitifs, l'amour passionnel a un effet positif sur l'attraction physique et l'expérience sensorielle mais nous n'avons pas trouvé de relation entre l'amour passionnel et la créativité (pensées divergentes et convergentes). Les résultats de ces différentes études sont présentés et discutés en s'appuyant sur les perspectives interculturelle, neuropsychologique et évolutionniste de l'amour romantique. L'amour passionnel peut être vécu de plusieurs façons mais ses manifestations sont universelles. Nous concluons que l'amour passionnel est principalement un phénomène biologique qui peut être influencé par la culture, assurant des reproductions réussies de notre espèce. / The main goal of this thesis is to explore the romantic feelings of passionate love widely defined as a state of longing with another. This construct is generally considered to be a universal experience strongly associated with sexual arousal and capable of having a strong effect in emotional, cognitive and behavioral dimensions. The main goal of this project is to provide further evidence about the contention that although subjective experiences of passionate love are culturally and contextually determinate, people all over the world present the same symptoms of passionate love with the same intensity when they consider being in love. Plus, the influences of passionate love on cognitive processes were tested in other studies. A total of 1000 college students participated in 4 different studies. The Passionate Love Scale (PLS) was administrated on Brazilian and French subjects in order to explore their evaluation of passionate love through cognitive, emotional and behavioral components. The social representations of these same groups about passionate love were explored with a structural analysis of word associations. Cognitive processes were tested through one study about the relationship between passionate love and sensory experience and another one about the effect of passionate love in creative productions. The results found with the PLS indicated the same psychometric properties in France and in Brazil. In both cases, the factorial analysis indicated one stronger dimension with high internal consistencies. Subjects in love seemed to love with equal passion in both cultures but gender differences were found in Brazil. The analysis of the word association revealed contextual, cultural and gender differences. Passionate love had a positive effect in low cognitive processes (physical attraction and sensory experience) but no effect in high cognitive tasks (divergent and convergent thinking). The results of these different studies are presented and discussed in the light of cross-cultural, neuropsychological and evolutionary perspectives on romantic love. Passionate love might be experienced in a number of ways but its manifestation is universally the same. It is concluded that passionate love might be mainly a biological phenomenon with minor cultural variations directed to insure reproductive success in our species.

The overarching question of the study was how common mutual love is, and to what extent attachment relates to relationship asymmetries. Four research questions and four hypotheses were posed and explored using a cross-sectional survey design with data analyzed using quantitative methods. Instruments were employed to measure passionate love, companionate love, partner value, emotional involvement and attachment. All four hypotheses found partial support. The main result show that a) asymmetries are relatively common on all scales b) mutual love means increased satisfaction, but mainly for women c) for most couples partners take turn at being the strong link, and this fluctuating dynamic leads to increased satisfaction c) attachment anxiety is related to asymmetries in romantic obsession rather than general passion d) avoidance in men relate to asymmetries in passionate love whereas avoidance in women relate to asymmetries in companionate love e) it seems common to have some form of positive illusions about whether one’s relationship is mutual or not. Finally, disagreeing about emotional involvement affects satisfaction more than actual asymmetries in love. The conclusion drawn is that honest communication is more important than mutual love.