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While not strictly psychological, Plato's Symposium laid the groundwork for understanding love through his concept of 'Platonic love' and the idea that humans seek their 'other half.' This philosophical foundation influenced later psychological theories.

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1886: Psychology of Emotions by William James

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1886: Psychology of Emotions by William James

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William James introduced his theory of emotions, which while not specifically about love, provided a framework for understanding emotional experiences, including love, as physiological responses followed by emotional interpretation.

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Sigmund Freud presented his psychoanalytic perspective on love in 'Group Psychology and the Analysis of the Ego,' connecting love to early childhood experiences and the development of the libido. He viewed romantic love as a manifestation of deeper psychological drives.

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Abraham Maslow included love and belongingness as essential human needs in his hierarchy, positioning them after basic physiological and safety needs but before esteem and self-actualization.

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Harlow's groundbreaking experiments with rhesus monkeys demonstrated the importance of comfort and attachment in love, challenging the prevailing behavioral theories that linked attachment solely to feeding.

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John Bowlby formalized attachment theory, explaining how early bonds with caregivers influence later romantic relationships and emotional development. This theory revolutionized our understanding of love and attachment across the lifespan.

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John Alan Lee proposed the Colors of Love theory, identifying six styles of love: Eros (romantic), Ludus (playful), Storge (companionate), Pragma (practical), Mania (obsessive), and Agape (selfless).

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1986: Sternberg's Triangular Theory of Love

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1986: Sternberg's Triangular Theory of Love

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Robert Sternberg introduced his Triangular Theory of Love, comprising three components: intimacy, passion, and commitment. Different combinations of these elements result in different types of love relationships.

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Gary Chapman published his concept of the Five Love Languages, suggesting that people express and receive love differently through: Words of Affirmation, Acts of Service, Receiving Gifts, Quality Time, and Physical Touch.

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2000: Helen Fisher's Brain in Love Studies

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2000: Helen Fisher's Brain in Love Studies

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Anthropologist Helen Fisher began using fMRI technology to study the brain in love, identifying three brain systems involved in romantic love: lust, attraction, and attachment. Her work provided the first biological evidence of love's effect on the brain.

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2012: Love 2.0 Theory by Barbara Fredrickson

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2012: Love 2.0 Theory by Barbara Fredrickson

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Fredrickson proposed a new understanding of love as micro-moments of positive resonance between people, rather than a lasting, constant state. This theory emphasized the biological and behavioral synchrony that occurs during loving interactions.