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One pair of lovers.
Throughout history, philosophy and religion have done the most speculative phenomenon of love. In the 20th century, psychology, science writing about this issue a lot. In recent years, scientific psychology, anthropology, neuroscience, biology has been added to the of the nature and function of love.
Main article: the biological basis of love
Biological models tend to love as a mammalian drive, like hunger or thirst. Helen Fisher, a leading topic of love experts, divided into three parts love experience overlapping phases: desire, attraction and Desire is the feeling of sexual desire; romantic attraction determines the teammates partner find attractive and pursue, saving time and effort by choosing; and accessories include sharing a home, parental responsibilities, common defense, and in relation to human security and sense of security. Three different neural circuits, including neurotransmitters, and three kinds of behavior patterns, is related to these three romantic style.
Lust is the initial passionate sexual desire, promote mating, involving chemicals, such as testosterone and increase the release of estrogen. These effects rarely last more than a few weeks or months. Interest is more personal and romantic desire for a specific candidate for mating, which developed the lust commitment to individual mate forms. Recent neuroscience research shows that when people fall in love, the brain sustained release of a specific set of chemical substances, including hormones neurotransmitters, dopamine, norepinephrine and serotonin, amphetamine released the same compound stimulate the brain's pleasure center, and cause side effects such as increased heart rate, appetite and sleep loss, and a strong sense of excitement. Research shows that this stage generally lasts from one and a half to three years.
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