Evolutionary explanation 1: Neurobiology of love
Fisher (2004): love is a human universal emotion and evolution has produced three distinct motivational brain systems in all birds and mammals to direct courtship, mating, reproduction, and parenting: attraction, the sex drive, and attachment. The three systems interact with each other to produce the combination of emotions, motivations, and behaviors associated with “love”.
Fisher (2004): Attraction is the equivalent to human romantic love in animals and evolved to motivate individuals to select and focus courtship attention on a favored partner.
Attraction is characterized by:
- increased energy
- focused attention on a specific mate
- obsessive following
- romantic gestures
- possessive mate-guarding
- motivation to win a preferred mating partner
Evolved to motivate individuals to stay with the preferred reproductive partner long enough to complete parental duties and experience this as rewarding.
Attachment in animals in characterized by:
- Mutual nest building
- grooming
- maintenance of close proximity
- separation anxiety
- shared parental chores
Animal research suggests that this brain system is associated primarily with oxytocin in the nucleus accumbens (the brain’s reward centre).
Participants:
- Self-selected sample of 103 female and 66 male undergraduate students who were single but interested in finding a romantic partner (mean age 19.01)
- Recruited through advertisements
Procedure:
- Participants completed a questionnaire where:
- They rated their own personality
- Described the personality of their romantic ideal.
- Completed filler questionnaires to disguise the true purpose of the study
Results:
- All participants wanted a romantic partner similar to themselves.
- Warm people were attracted to others who were warm.
- The same was found for dominance.
- Indicates that people believe that similarity in a potential partner is important but maybe this ideal partner is difficult to find.
- A follow-up study with a new sample found that romantic couples who experienced high levels of love and harmony were more likely to consist of one individual who was dominant and one who was submissive
- Indicates that complementarity on certain personality factors could affect harmony positively.
Similarity-attraction hypothesis:
- Assumes that people are likely to be attracted to individuals who are perceived to be similar to themselves.
- Because people who share our attitudes and values validate ourselves and boosts our self-esteem, which in turn leads to attraction.
Proximity factor – physical closeness is important in attraction
Proximity theory of attraction:
Simply being in the physical presence of another individual will enhance the probability of becoming friends.
- Evolved to produce offspring.
Characterized by:
- Craving for sexual gratification
In humans, this is associated primarily with testosterone in both men and women.