By Elizabeth Landau, CNN
Poets, novelists and songwriters have described it in countless turns of phrase, but at the level of biology, love is all about chemicals.
Although the physiology of romantic love has not been extensively studied, scientists can trace the symptoms of deep attraction to their logical sources.
"Part of the whole attraction process is strongly linked to physiological arousal as a whole," said Timothy Loving (his real name), assistant professor of human ecology at the University of Texas, Austin. "Typically, that's going to start with things like increased heart rate, sweatiness and so on,"
When you catch sight of your beloved and your heart starts racing, that's because of an adrenaline rush, said Dr. Reginald Ho, a cardiac electrophysiologist and associate professor of medicine at Thomas Jefferson University Hospital in Philadelphia, Pennsylvania.
Here's how it works: The brain sends signals to the adrenal gland, which secretes hormones such as adrenaline, epinephrine and norepinephrine. They flow through the blood and cause the heart to beat faster and stronger, Ho said.
The response is somewhat similar to a fast heartbeat while running on a treadmill, although exercise has other benefits, he said.
For people with serious heart problems, love could actually be dangerous, Ho said. That's because when the heart rate goes up, the heart uses more oxygen, which can be risky for an older person with blood vessel blockages or who has had a prior heart attack. But good medicines such as beta blockers help curb the adrenaline response, Ho said.
It is also likely that norepinephrine, a stress hormone that governs attention and responding actions, makes you feel weak in the knees, said Helen Fisher, professor at Rutgers University and author of the book "Why Him? Why Her? Finding Real Love by Understanding Your Personality Type."
Fisher's research team did brain imaging of people who said they were "madly in love" and found activity in the area of the brain that produces the neurotransmitter dopamine. Dopamine and norepinephrine are closely related.
"What dopamine does is it gives you that focused attention, the craving, the euphoria, the energy and the motivation, in this case the motivation to win life's greatest prize," she said.
This norepinephrine response has never been precisely studied in relation to romantic love, but the system seems to be more activated in people in love, she said.
Also likely involved is the serotonin system, she said. Some data from an Italian study indicate that a drop in serotonin levels is associated with obsessive thinking.
The stress hormone cortisol has also been shown to have implications for love, Loving said. His lab showed study participants who had recently fallen in love a picture of a romantic partner or friend, and had them describe or "relive" the moment of falling in love or wanting to be friends, respectively. Those who recalled falling in love showed an increase in stress hormones such as cortisol even 30 minutes after they were asked to think about it.
Generally, there are three brain systems involved in romantic love: sex drive, love and attachment, Fisher said. The sex drive evolved to get you to look for a lot of partners, the "love" portion is for focusing mating energy on one specific person at a time, and attachment is for allowing you to tolerate the partner -- at least, long enough to have children with him or her.
These systems are often connected, but can operate separately, she said. That means you can start out with one of them -- casual sex, or an intense feeling of love, or an emotional connection -- and move on to the others. For example, what may start out as a one-night stand may feel like more because the hormones oxytocin and vasopressin, released during orgasm, make you feel deeply attached to someone. You may feel in love after that, or instead feel somehow responsible for the person, because of these hormones.
Fisher's team has found that romantic love doesn't have to die -- they found the same activity in the brains of people who said they were in love after 20 years of marriage as in people who had just fallen in love. This brain area makes dopamine and sends it to other areas.
In the days of early humans, in hunting-and-gathering societies, these qualities were especially advantageous for finding a person to bear and raise children with, she said.
Why, then, do small children fall in love if they are not trying to reproduce? Fisher hypothesizes that kids -- even 4-year-olds -- practice at love and learning more about themselves before it begins to become important to them.
Love also has health benefits for people who have aged beyond their reproductive years, she said. Being in love makes people feel optimistic, energetic, focused and motivated, which were all positive for health and societal contribution in the early days of humans, she said. So, it makes sense evolutionarily that people can still fall in love after their childbearing period.
Romance also is good for you. Studies have shown that people who have frequent sex are generally healthier, with a longer life, fewer coronary events and lower blood pressure. A 1995 study in the journal Demography found that marriage adds seven years to a man's life and two years to a woman's.
Loving's team is studying how people who have recently fallen in love respond to stressful situations. They hypothesize that people for whom the love is still new will respond to the stress and recover from it quicker than those who have recently been in a breakup or have been in a relationship for a long time.
"The guess is that when individuals are falling in love, they are walking around with rose-colored glasses," he said.
[source]
Showing posts with label study. Show all posts
Showing posts with label study. Show all posts
Tuesday, February 16
Monday, October 5
The top ten things you didn't know about Iran
The assumptions most Americans hold about Iran and its policies are wrong
By Juan Cole
Thursday is a fateful day for the world, as the U.S., other members of the United Nations Security Council, and Germany meet in Geneva with Iran in a bid to resolve outstanding issues. Although Iranian president Mahmoud Ahmadinejad had earlier attempted to put the nuclear issue off the bargaining table, this rhetorical flourish was a mere opening gambit and nuclear issues will certainly dominate the talks. As Henry Kissinger pointed out, these talks are just beginning and there are highly unlikely to be any breakthroughs for a very long time. Diplomacy is a marathon, not a sprint.
But on this occasion, I thought I'd take the opportunity to list some things that people tend to think they know about Iran, but for which the evidence is shaky.
Belief: Iran is aggressive and has threatened to attack Israel, its neighbors or the U.S.
Reality: Iran has not launched an aggressive war modern history (unlike the U.S. or Israel), and its leaders have a doctrine of "no first strike." This is true of Supreme Leader Ali Khamenei, as well as of Revolutionary Guards commanders.
Belief: Iran is a militarized society bristling with dangerous weapons and a growing threat to world peace.
Reality: Iran's military budget is a little over $6 billion annually. Sweden, Singapore and Greece all have larger military budgets. Moreover, Iran is a country of 70 million, so that its per capita spending on defense is tiny compared to these others, since they are much smaller countries with regard to population. Iran spends less per capita on its military than any other country in the Persian Gulf region with the exception of the United Arab Emirates.
Belief: Iran has threatened to attack Israel militarily and to "wipe it off the map."
Reality: No Iranian leader in the executive has threatened an aggressive act of war on Israel, since this would contradict the doctrine of 'no first strike' to which the country has adhered. The Iranian president has explicitly said that Iran is not a threat to any country, including Israel.
Belief: But didn't President Mahmoud Ahmadinejad threaten to "wipe Israel off the map?"
Reality: President Mahmoud Ahmadinejad did quote Ayatollah Khomeini to the effect that "this Occupation regime over Jerusalem must vanish from the page of time" (in rezhim-e eshghalgar-i Qods bayad as safheh-e ruzgar mahv shavad). This was not a pledge to roll tanks and invade or to launch missiles, however. It is the expression of a hope that the regime will collapse, just as the Soviet Union did. It is not a threat to kill anyone at all.
Belief: But aren't Iranians Holocaust deniers?
Reality: Some are, some aren't. Former president Mohammad Khatami has castigated Ahmadinejad for questioning the full extent of the Holocaust, which he called "the crime of Nazism." Many educated Iranians in the regime are perfectly aware of the horrors of the Holocaust. In any case, despite what propagandists imply, neither Holocaust denial (as wicked as that is) nor calling Israel names is the same thing as pledging to attack it militarily.
Belief: Iran is like North Korea in having an active nuclear weapons program, and is the same sort of threat to the world.
Reality: Iran has a nuclear enrichment site at Natanz near Isfahan where it says it is trying to produce fuel for future civilian nuclear reactors to generate electricity. All Iranian leaders deny that this site is for weapons production, and the International Atomic Energy Agency has repeatedly inspected it and found no weapons program. Iran is not being completely transparent, generating some doubts, but all the evidence the IAEA and the CIA can gather points to there not being a weapons program. The 2007 National Intelligence Estimate by 16 U.S. intelligence agencies, including the CIA and the Defense Intelligence Agency, assessed with fair confidence that Iran has no nuclear weapons research program. This assessment was based on debriefings of defecting nuclear scientists, as well as on the documents they brought out, in addition to U.S. signals intelligence from Iran. While Germany, Israel and recently the U.K. intelligence is more suspicious of Iranian intentions, all of them were badly wrong about Iraq's alleged Weapons of Mass Destruction and Germany in particular was taken in by Curveball, a drunk Iraqi braggart.
Belief: The West recently discovered a secret Iranian nuclear weapons plant in a mountain near Qom.
Reality: Iran announced Monday a week ago to the International Atomic Energy Agency that it had begun work on a second, civilian nuclear enrichment facility near Qom. There are no nuclear materials at the site and it has not gone hot, so technically Iran is not in violation of the Nuclear Non-Proliferation Treaty, though it did break its word to the IAEA that it would immediately inform the UN of any work on a new facility. Iran has pledged to allow the site to be inspected regularly by the IAEA, and if it honors the pledge, as it largely has at the Natanz plant, then Iran cannot produce nuclear weapons at the site, since that would be detected by the inspectors. Secretary of State Hillary Clinton admitted on Sunday that Iran could not produce nuclear weapons at Natanz precisely because it is being inspected. Yet American hawks have repeatedly demanded a strike on Natanz.
Belief: The world should sanction Iran not only because of its nuclear enrichment research program but also because the current regime stole June's presidential election and brutally repressed the subsequent demonstrations.
Reality: Iran's reform movement is dead set against increased sanctions on Iran, which likely would not affect the regime, and would harm ordinary Iranians.
Belief: Isn't the Iranian regime irrational and crazed, so that a doctrine of mutally assured destruction just would not work with them?
Reality: Iranian politicians are rational actors. If they were madmen, why haven't they invaded any of their neighbors? Saddam Hussein of Iraq invaded both Iran and Kuwait. Israel invaded its neighbors more than once. In contrast, Iran has not started any wars. Demonizing people by calling them unbalanced is an old propaganda trick. The U.S. elite was once unalterably opposed to China having nuclear science because they believed the Chinese are intrinsically irrational. This kind of talk is a form of racism.
Belief: The international community would not have put sanctions on Iran, and would not be so worried, if it were not a gathering nuclear threat.
Reality: The centrifuge technology that Iran is using to enrich uranium is open-ended. In the old days, you could tell which countries might want a nuclear bomb by whether they were building light water reactors (unsuitable for bomb-making) or heavy-water reactors (could be used to make a bomb). But with centrifuges, once you can enrich to 5% to fuel a civilian reactor, you could theoretically feed the material back through many times and enrich to 90% for a bomb. However, as long as centrifuge plants are being actively inspected, they cannot be used to make a bomb. The two danger signals would be if Iran threw out the inspectors or if it found a way to create a secret facility. The latter task would be extremely difficult, however, as demonstrated by the CIA's discovery of the Qom facility construction in 2006 from satellite photos. Nuclear installations, especially centrifuge ones, consume a great deal of water, construction materiel, and so forth, so that constructing one in secret is a tall order. In any case, you can't attack and destroy a country because you have an intuition that they might be doing something illegal. You need some kind of proof. Moreover, Israel, Pakistan and India are all much worse citizens of the globe than Iran, since they refused to sign the NPT and then went for broke to get a bomb; and nothing at all has been done to any of them by the UNSC.
Juan Cole is a professor of modern Middle Eastern and South Asian history at the University of Michigan and the author of "Engaging the Muslim World."
(sauce)
By Juan Cole
Thursday is a fateful day for the world, as the U.S., other members of the United Nations Security Council, and Germany meet in Geneva with Iran in a bid to resolve outstanding issues. Although Iranian president Mahmoud Ahmadinejad had earlier attempted to put the nuclear issue off the bargaining table, this rhetorical flourish was a mere opening gambit and nuclear issues will certainly dominate the talks. As Henry Kissinger pointed out, these talks are just beginning and there are highly unlikely to be any breakthroughs for a very long time. Diplomacy is a marathon, not a sprint.
But on this occasion, I thought I'd take the opportunity to list some things that people tend to think they know about Iran, but for which the evidence is shaky.
Belief: Iran is aggressive and has threatened to attack Israel, its neighbors or the U.S.
Reality: Iran has not launched an aggressive war modern history (unlike the U.S. or Israel), and its leaders have a doctrine of "no first strike." This is true of Supreme Leader Ali Khamenei, as well as of Revolutionary Guards commanders.
Belief: Iran is a militarized society bristling with dangerous weapons and a growing threat to world peace.
Reality: Iran's military budget is a little over $6 billion annually. Sweden, Singapore and Greece all have larger military budgets. Moreover, Iran is a country of 70 million, so that its per capita spending on defense is tiny compared to these others, since they are much smaller countries with regard to population. Iran spends less per capita on its military than any other country in the Persian Gulf region with the exception of the United Arab Emirates.
Belief: Iran has threatened to attack Israel militarily and to "wipe it off the map."
Reality: No Iranian leader in the executive has threatened an aggressive act of war on Israel, since this would contradict the doctrine of 'no first strike' to which the country has adhered. The Iranian president has explicitly said that Iran is not a threat to any country, including Israel.
Belief: But didn't President Mahmoud Ahmadinejad threaten to "wipe Israel off the map?"
Reality: President Mahmoud Ahmadinejad did quote Ayatollah Khomeini to the effect that "this Occupation regime over Jerusalem must vanish from the page of time" (in rezhim-e eshghalgar-i Qods bayad as safheh-e ruzgar mahv shavad). This was not a pledge to roll tanks and invade or to launch missiles, however. It is the expression of a hope that the regime will collapse, just as the Soviet Union did. It is not a threat to kill anyone at all.
Belief: But aren't Iranians Holocaust deniers?
Reality: Some are, some aren't. Former president Mohammad Khatami has castigated Ahmadinejad for questioning the full extent of the Holocaust, which he called "the crime of Nazism." Many educated Iranians in the regime are perfectly aware of the horrors of the Holocaust. In any case, despite what propagandists imply, neither Holocaust denial (as wicked as that is) nor calling Israel names is the same thing as pledging to attack it militarily.
Belief: Iran is like North Korea in having an active nuclear weapons program, and is the same sort of threat to the world.
Reality: Iran has a nuclear enrichment site at Natanz near Isfahan where it says it is trying to produce fuel for future civilian nuclear reactors to generate electricity. All Iranian leaders deny that this site is for weapons production, and the International Atomic Energy Agency has repeatedly inspected it and found no weapons program. Iran is not being completely transparent, generating some doubts, but all the evidence the IAEA and the CIA can gather points to there not being a weapons program. The 2007 National Intelligence Estimate by 16 U.S. intelligence agencies, including the CIA and the Defense Intelligence Agency, assessed with fair confidence that Iran has no nuclear weapons research program. This assessment was based on debriefings of defecting nuclear scientists, as well as on the documents they brought out, in addition to U.S. signals intelligence from Iran. While Germany, Israel and recently the U.K. intelligence is more suspicious of Iranian intentions, all of them were badly wrong about Iraq's alleged Weapons of Mass Destruction and Germany in particular was taken in by Curveball, a drunk Iraqi braggart.
Belief: The West recently discovered a secret Iranian nuclear weapons plant in a mountain near Qom.
Reality: Iran announced Monday a week ago to the International Atomic Energy Agency that it had begun work on a second, civilian nuclear enrichment facility near Qom. There are no nuclear materials at the site and it has not gone hot, so technically Iran is not in violation of the Nuclear Non-Proliferation Treaty, though it did break its word to the IAEA that it would immediately inform the UN of any work on a new facility. Iran has pledged to allow the site to be inspected regularly by the IAEA, and if it honors the pledge, as it largely has at the Natanz plant, then Iran cannot produce nuclear weapons at the site, since that would be detected by the inspectors. Secretary of State Hillary Clinton admitted on Sunday that Iran could not produce nuclear weapons at Natanz precisely because it is being inspected. Yet American hawks have repeatedly demanded a strike on Natanz.
Belief: The world should sanction Iran not only because of its nuclear enrichment research program but also because the current regime stole June's presidential election and brutally repressed the subsequent demonstrations.
Reality: Iran's reform movement is dead set against increased sanctions on Iran, which likely would not affect the regime, and would harm ordinary Iranians.
Belief: Isn't the Iranian regime irrational and crazed, so that a doctrine of mutally assured destruction just would not work with them?
Reality: Iranian politicians are rational actors. If they were madmen, why haven't they invaded any of their neighbors? Saddam Hussein of Iraq invaded both Iran and Kuwait. Israel invaded its neighbors more than once. In contrast, Iran has not started any wars. Demonizing people by calling them unbalanced is an old propaganda trick. The U.S. elite was once unalterably opposed to China having nuclear science because they believed the Chinese are intrinsically irrational. This kind of talk is a form of racism.
Belief: The international community would not have put sanctions on Iran, and would not be so worried, if it were not a gathering nuclear threat.
Reality: The centrifuge technology that Iran is using to enrich uranium is open-ended. In the old days, you could tell which countries might want a nuclear bomb by whether they were building light water reactors (unsuitable for bomb-making) or heavy-water reactors (could be used to make a bomb). But with centrifuges, once you can enrich to 5% to fuel a civilian reactor, you could theoretically feed the material back through many times and enrich to 90% for a bomb. However, as long as centrifuge plants are being actively inspected, they cannot be used to make a bomb. The two danger signals would be if Iran threw out the inspectors or if it found a way to create a secret facility. The latter task would be extremely difficult, however, as demonstrated by the CIA's discovery of the Qom facility construction in 2006 from satellite photos. Nuclear installations, especially centrifuge ones, consume a great deal of water, construction materiel, and so forth, so that constructing one in secret is a tall order. In any case, you can't attack and destroy a country because you have an intuition that they might be doing something illegal. You need some kind of proof. Moreover, Israel, Pakistan and India are all much worse citizens of the globe than Iran, since they refused to sign the NPT and then went for broke to get a bomb; and nothing at all has been done to any of them by the UNSC.
Juan Cole is a professor of modern Middle Eastern and South Asian history at the University of Michigan and the author of "Engaging the Muslim World."
(sauce)
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