Placebo effect

📖 Bài đọc (reading passage)

Placebo effect
Want to devise a new form of alternative medicine? No problem. Here is the recipe. Be warm, sympathetic, reassuring and enthusiastic. Your treatment should involve physical contact, and each session with your patients should last at least half an hour. Encourage your patients to take an active part in their treatment and understand how their disorders relate to the rest of their lives. Tell them that their own bodies possess the true power to heal. Make them pay you out of their own pockets. Describe your treatment in familiar words, but embroidered with a hint of mysticism: energy fields, energy flows, energy blocks, meridians, forces, auras, rhythms and the like. Refer to the knowledge of an earlier age: wisdom carelessly swept aside by the rise and rise of blind, mechanistic science. Oh, come off it, you are saying. Something invented off the top of your head could not possibly work, could it? 

Well yes, it could-and often well enough to earn you a living. A good living if you are sufficiently convincing, or, better still, really believes in your therapy. Many illnesses get better on their own, so if you are lucky and administer your treatment at just the right time you will get the credit. But that’s only part of it. Some of the improvement really would be down to you. Your healing power would be the outcome of a paradoxical force that conventional medicine recognizes but remains oddly ambivalent about: the placebo effect. 

Placebos are treatments that have no direct effect on the body, yet still work because the patient has faith in their power to heal. Most often the term refers to a dummy pill, but it applies just as much to any device or procedure, from a sticking plaster to a crystal to an operation. The existence of the placebo effect implies that even quackery may confer real benefits, which is why any mention of placebo is a touchy subject for many practitioners of complementary and alternative medicine, who are likely to regard it as tantamount to a charge of charlatanism. In fact, the placebo effect is a powerful part of all medical care, orthodox or otherwise, though its role is often neglected or misunderstood. 

One of the great strengths of CAM may be its practitioners’ skill in deploying the placebo effect to accomplish real healing. “Complementary practitioners are miles better at producing non-specific effects and good therapeutic relationships,” says Edzard Ernst, professor of CAM at Exeter University. The question is whether CAM could be integrated into conventional medicine, as some would like, without losing much of this power. 

At one level, it should come as no surprise that our state of mind can influence our physiology: anger opens the superficial blood vessels of the face; sadness pumps the tear glands. But exactly how placebos work their medical magic is still largely unknown. Most of the scant research done so far has focused on the control of pain, because it’s one of the commonest complaints and lends itself to experimental study. Here, attention has turned to the endorphins, morphine-like neurochemicals known to help control pain. “Any of the neurochemicals (which are) involved in transmitting pain impulses or modulating them might also be involved in generating the placebo response,” says Don Price, an oral surgeon at the University of Florida who studies the placebo effect in dental pain.

“But endorphins are still out in front.” That case has been strengthened by the recent work of Fabrizio Benedetti of the University of Turin, who showed that the placebo effect can be abolished by a drug, naloxone, which blocks the effects of endorphins. Benedetti induced pain in human volunteers by inflating a blood-pressure cuff on the forearm. He did this several times a day for several days, using morphine each time to control the pain. On the final day, without saying anything, he replaced the morphine with a saline solution. This still relieved the subjects’ pain: a placebo effect. But when he added naloxone to the saline, the pain relief disappeared. Here was direct proof that placebo analgesia is mediated, at least in part, by these natural opiates. 

Still, no one knows how belief triggers endorphin release, or why most people can’t achieve placebo pain relief simply by willing it. Though scientists don’t know exactly how placebos work, they have accumulated a fair bit of knowledge about how to trigger the effect. A London rheumatologist found, for example, that red dummy capsules made more effective painkillers than blue, green or yellow ones. Research on American students revealed that blue pills make better sedatives than pink, a color more suitable for stimulants. Even branding can make a difference: if Aspro or Tylenol are what you like to take for a headache, their chemically identical generic equivalents may be less effective. 

It matters, too, how the treatment is delivered. Decades ago, when the major tranquillizer chlorpromazine was being introduced, a doctor in Kansas categorized his colleagues according to whether they were keen on it, openly skeptical of its benefits, or took a “let’s try and see” attitude. His conclusion: the more enthusiastic the doctor, the better the drug performed. And this year Ernst surveyed published studies that compared doctors’ bedside manners. The studies turned up one consistent finding: “Physicians who adopt a warm, friendly and reassuring manner,” he reported, “are more effective than those whose consultations are formal and do not offer reassurance.” 

Warm, friendly and reassuring is precisely CAM’S strong suits, of course. Many of the ingredients of that opening recipe—the physical contact, the generous swathes of time, the strong hints of supernormal healing power are just the kind of thing likely to impress patients. It’s hardly surprising, then, that complementary practitioners are generally best at mobilizing the placebo effect, says Arthur Kleinman, professor of social anthropology at Harvard University.

❓ Câu hỏi (questions)

List of Endings

Should easily be understood

Should improve by itself

Should not involve any mysticism

Ought to last a minimum length of time.

Needs to be treated at the right time.

Should give more recognition.

Can earn valuable money.

Do not rely on any specific treatment

Appointments with an alternative practitioner

An alternative practitioner’s description of treatment

An alternative practitioner who has faith in what he does

The illness of patients convinced of alternative practice

Improvements of patients receiving alternative practice

Conventional medical doctors

In the fifth paragraph, the writer uses the example of anger and sadness to illustrate that

People’s feeling could affect their physical behaviour

Scientists don’t understand how the mind influences the body.

Research on the placebo effect is very limited

How placebo achieves its effect is yet to be understood.

Research on pain control attracts most of the attention because

Scientists have discovered that endorphins can help to reduce pain.

Only a limited number of researchers gain relevant experience

Pain reducing agents might also be involved in the placebo effect.

Patients often experience pain and like to complain about it

Fabrizio Benedetti’s research on endorphins indicates that

They are widely used to regulate pain.

They can be produced by willful thoughts

They can be neutralized by introducing naloxone.

Their pain-relieving effects do not last long enough.

There is enough information for scientists to fully understand the placebo effect.

A London based researcher discovered that red pills should be taken off the market.

People’s preference on brands would also have effect on their healing.

Medical doctors have a range of views of the newly introduced drug of chlopromazine.

Alternative practitioners are seldom known for applying placebo effect.

🔥 Answer key (đáp án và giải thích)

Giải thích chi tiết

☺️ Ứng dụng Linearthinking để giải quyết dạng bài Matching Sentence Endings

Step 01: Read the question to understand (main idea + detail)

Simplified: Appointments with alternative practitioner ...
Main idea: Các buổi hẹn/phiên khám với một người làm alternative medicine (CAM) có đặc điểm gì (đặc biệt là về cách diễn ra).
Prediction: Cần một Verb phrase / requirement mô tả đặc điểm của appointment (thường là về thời lượng/cách thực hiện).

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Step 02: Locate relevant information

🔍 Từ khoá: appointments, alternative practitioner
Mục tiêu: Tìm đoạn nói về “appointments/sessions” của treatment và có nhắc đến thời lượng.

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Step 03: Read relevant information to understand (main + detail)

📌 Trích dẫn: "each session with your patients should last at least half an hour."

Simplified: each session with your patients should last at least half an hour
Main idea: Mỗi buổi session nên kéo dài tối thiểu một khoảng thời gian (ít nhất 30 phút).

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Step 04: Compare meaning with meaning

Ghép “Appointments with alternative practitioner …” với các options:

✅ D. Ought to last a minimum length of time. Khớp trực tiếp với bằng chứng: “should last at least half an hour” = có thời lượng tối thiểu.

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❌ Các đáp án bẫy hay nhầm:

B. Should improve by itself / E. Needs to be treated at the right time.: thuộc ý “illness tự khỏi” và “đúng thời điểm” ở đoạn sau (“Many illnesses get better on their own… administer… at just the right time”), không nói về appointment length.
A / C: “familiar words” + “hint of mysticism” cho thấy có mysticism, nên C sai; A cũng không phải trọng tâm được hỏi ở đây.

Xem full giải thích

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