Now and then we all get ill. Then we usually go to see a doctor. Doctors know a lot about what makes us ill. They may give us something to take. The medicine(药) often makes us well again. But sometimes the doctor's medicine doesn't work. A sick person does not get well. The pain(疼痛)will not go away. This happened to one man. He was in hospital, but he was not getting well. Then he found a new “doctor” inside himself. This new “doctor” was his own sense of humor. He saw funny films. He read funny books. And something wonderful happened. Laughing took away his pain. Then he was able to sleep and rest. His own happy feeling helped him to feel well again. He said laughing was his best “medicine”. His doctor thought so, too.

Another man was also ill, and he had a terrible pain in his back. The doctors could not stop it from hurting. So the man began to “Picture” his pain. In his head he “drew” a picture of a dog. He imagined(想象)it as a real dog. And he made friends with the dog. And his pain went away!

These stories may surprise you. But more and more people are getting well in this way. So visit the “doctor” inside your own head and you can stay happy and well.

Using a headset at home to deliver a low electrical current to the brain can relieve symptoms of depression. The approach, called transcranial direct current stimulation (tDCS), is effective when used several times a week for half an hour at a time.

Previous trials have shown that the therapy works under medical supervision in a clinic or lab. Now, a randomised trial has demonstrated that a tDCS headset can also reduce depression symptoms when worn at home.

Several forms of electrical brain stimulation may have the potential to treat depression. With tDCS, sponge electrodes are placed on the left and right sides of the forehead, causing a mild current to flow from the left to the right. This makes brain cells on the left side more likely to fire, with some studies suggesting that activity in this region is low in people with depression.

Repeated sessions of stimulation may lead to longer term changes in the brain cells, increasing their activity levels, says team member Cynthia Fu at the University of East London. Affecting activity in this region probably alters activity in multiple areas, she says. “There are probably many brain regions causing depression.”

To see if people can benefit from using such a device at home, the team randomly assigned 174 people with moderate or severe depression to receive either a full session of stimulation from the headset or stimulation from the same device that lasted just a few seconds. People felt their skin aching at the start and end of each session.

While the depression symptoms of both groups improved on a 52-point scale, those who got the real treatment showed the most benefit, by about 9 points compared with 7, a degree of difference that is similar to that seen with antidepressants (抗抑郁药), “We found people liked having it at home,” says Fu. “Participants could build it into their day.”

A man with advanced Parkinson’s disease (帕金森氏症) is now able to walk almost normally again thanks to electrodes implanted (电极植入) in his spinal cord (脊椎), researchers said on Monday. The medical first was achieved by Swiss researchers who had previously pioneered similar breakthroughs to help disabled people walk again.

“This could be a game-changing technology to help bring back movement in people with advanced Parkinson’s,” said David Dexter, research director at Parkinson’s UK.

Marc Gauthier, the 62-year-old patient who lives in France, has suffered from the brain disorder for about 30 years. Like more than 90 percent of people with advanced Parkinson’s, Mar c has had great difficulty walking. What are known as “freezing” experiences — during which patients are unable to move for a limited time, putting them at risk of falling — are particularly awful, Marc told AFP.

Much remains unknown about Parkinson’s disease, making treatment difficult. But the disease can seriously affect the lives of patients, sometimes keeping them to bed or a wheelchair. So when the opportunity came to go through an operation in Switzerland, Marc gladly accepted the chance.

“Now I can do whatever I want,” Marc says. “I can go for a walk and go out shopping by myself.” He adds that he can now walk much more easily — he is even planning a trip to Brazil — but it still requires concentration, particularly when climbing upstairs.

The Swiss team, led by surgeon Jocelyne Bloch and neuroscientist Gregoire Courtine , implanted a complex system of electrodes called a “neuroprosthesis (神经假体)” at important points along Marc’s spinal cord. The neuroprosthesis was first tested on animals, and then implanted in Marc, who has used it for roughly eight hours a day over nearly two years.

The Swiss team has expanded their experiment to a group of six Parkinson’s patients, aiming to know how it could help others, given the disease affects people in different ways. However, treatment using the implant could be quite expensive, potentially limiting how many patients would have access.