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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Biology of romantic love | 11/14 | https://en.wikipedia.org/wiki/Biology_of_romantic_love | reference | science, encyclopedia | 2026-05-05T15:53:39.742070+00:00 | kb-cron |
=== Emotional valence === Rather than being a specific emotion itself, romantic love is believed to be a motivation or drive which elicits different emotions depending on the situation: positive feelings when things go well, and negative feelings when awry. Reciprocated love may elicit feelings of joy, ecstasy, or fulfillment, for example, but unrequited love may elicit feelings of sadness, anxiety, or despair. A 2014 study of Iranian young adults found that the early stage of romantic love was associated with the brighter side of hypomania (elation, mental and physical activity, and positive social interaction) and better sleep quality, but also stronger symptoms of depression and anxiety. Those authors conclude that romantic love is "not entirely a joyful and happy period of life". Romantic love may be either pleasant or unpleasant, regardless of the intensity level. One of Dorothy Tennov's interview participants recalls being in love this way: "When I felt [Barry] loved me, I was intensely in love and deliriously happy; when he seemed rejecting, I was still intensely in love, only miserable beyond words." The intensity of love feelings is also distinct from whether an individual is satisfied with their relationship (although the measures have been shown to be related to some extent). One can be satisfied with their relationship because it fulfills some other need besides love for their partner (like money or child care), or conversely be in love with an abuser in an abusive relationship. Unrequited love is common among young adults. A study by Roy Baumeister and Sarah Stillwell found that 92.8% of participants reported at least one "powerful or moderate" experience of unrequited love in the past 5 years. A different study found 63% had a "huge crush" at least once in the past 2 years (but not letting the person know), and unrequited love was four times more frequent than equal love. Another found that 20% had experienced unrequited love more than 5 times, according to a definition that "When one is experiencing this emotion, it has been described as having one’s emotions on a roller coaster, finding it difficult to concentrate, and thinking constantly about the person with whom you are in love. The person is said to have the power to produce extreme highs and lows of emotion in you, depending on how he or she acts towards you." In 2010, Helen Fisher, Arthur Aron and colleagues published their fMRI experiment investigating which areas of the brain might be active in recently rejected lovers. Participants had been in a relationship with their ex-partner for an average of 21 months, and then were post-rejection for an average of 63 days at the time of the experiment. These participants reported spending more than 85% of their waking hours thinking of their rejector, reported a lack of emotional control, and exhibited unhappiness, with sometimes more extreme emotions like depression, anger, and even paranoia in pre- and post-interviews. Similar to other fMRI experiments, the scan while looking at a photograph of the rejecting partner showed activations in dopaminergic reward system areas, like the ventral tegmental area and nucleus accumbens. These activations were also stronger than in a previous experiment of participants who were happily in love. The active nucleus accumbens, prefrontal cortex, and orbitofrontal cortex have been associated with assessing one's gains and losses, and active areas of the insular cortex and anterior cingulate cortex have been involved with physical pain and pain regulation (respectively) in other studies.
=== Stress and physiological arousal === In the early stages of romantic love, individuals may start out hypervigilant (hyperaware and sensitive to a partner's cues) due to uncertainty and novelty, but become synchronized over time as a relationship progresses. Bonding is thought to be in part facilitated by coordinated behaviors which display reciprocity and events which evoke beneficial stress, like a passionate kiss. The stress response system involves two major systems: the autonomic nervous system and the hypothalamic–pituitary–adrenal axis (HPA axis). Some experiments have been done which support the idea that the stress response is involved during the early stage of romantic love, measuring cortisol levels; however, these experiments have been inconsistent with respect to cortisol being higher or lower. In drug addiction, corticotropin release factor (CRF) is involved with the aversive effects of withdrawal. Stress causes CRF to release into the ventral tegmental area and nucleus accumbens shell, motivating reinstatement of drug use. A similar effect is also hypothesized in pair bonds, where stress after separation or social loss motivates a person to return to the partner; however, experiments have not investigated this in humans, only rodents. Helen Fisher believed that separation anxiety activates the HPA axis, producing these stress hormones. It's ironic, she says, because short-term stress can also produce dopamine and norepinephrine, so "as the adored one slips away, the very chemicals that contribute to feelings of romance grow even more potent".