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Brown University nerve scientist John Donoghue and colleagues give new hope to such patients in a paper in the journal Nature.

“The paper is about the technology that we’ve developed to help a paralyzed person communicate with the outside world again, to be able to use their thoughts to control devices,” said Mr. Donoghue.

Such patients might never be able to levitate a fork to feed themselves, but under Donoghue’s supervision, Nagle was able to do things just as exciting. With a tiny electronic sensor implanted in his brain, he was able to use a television, a robot arm, and even a computer.

“We have the patient imagine that he’s tracking a cursor on a screen,” he explained. “The patient is able to just think about moving and the cursor will move pretty much in the motion that the hand would take, if you were to imagine, say, moving left or right.”

Nagle opened e-mail, changed the volume on a television, opened and closed a prosthetic hand and performed basic actions with a multi-jointed robotic arm.

The implanted brain sensor making this possible had an array of electrodes that recorded nerve activity in an area typically involved in arm movement. This is the first demonstration that such brain activity persists in paralyzed people. The information recorded by the electrodes was decoded and processed by a computer, allowing nerve firing patterns to be translated into movement commands that drove the devices.

But John Donoghue told Nature magazine, the movements are not yet smooth.

“The motion of the cursor by thought is wobbly and unstable,” he noted. “What that means is that, at least, we haven’t found out how to exploit the brain’s plasticity. So, we need to change the computer to make the control signal better. We’re doing that, and actually having some good success.”

A way to improve performance is described in a second Nature paper by Stanford University researchers. Nerve scientist Krishna Shenoy and colleagues implanted sensors in monkey brains that recorded nerve activity further ahead in the circuit involved in arm movement, not near the nerve cells controlling the movement itself, but those involved with the intention to move.

“These cells relate to how you wish to move your arm and through mathematical algorithms we’re able to interpret those neurosignals to predict, which way one would wish to move their arm,” he said.

This is how it sounds.

The scientists were able to predict the intended location of movements before the monkeys made them.

Both sets of researchers say the implants are better than previous experiments with electrodes attached outside the scalp. The internal electrodes record nerve signals for specific movements, whereas the scalp electrodes sense activity throughout the brain.

Krishna Shenoy’s Stanford University colleague, spine specialist Stephen Ryu, says the research could help improve the quality of life for paralyzed people.

“But, in order to actually translate this to something, which will be helpful to people, we’re going to have to take it to another level, where we can show that they’re both safe, and that they’re effective, and can replace function that’s already been previously lost,” said Mr. Ryu.

A major issue is that the brain implants still require a lot of equipment. Ryu says that, to become practical, the devices will need to be much smaller and automated.

“I think it is only a matter of time before we really start to see some true promise from these things.”

Via VoaNews

This is encouraging. The Australian Mobile Telecommunications Association (www.amta.org.au) considers all mobile phones equally safe if they are under the independently tested Australian safety limit of two watts a kilogram (averaged over 10 grams), yet working on the premise that less is best, I prefer to choose one that’s lower in emissions.

What do these emissions mean? Randal Markey, the association’s communications manager, says “comparing SAR values is not like comparing, for example, energy efficiency stars on electrical appliances. A phone’s maximum SAR is always below safety standards, but varies widely during everyday use, whereas the energy efficiency of electrical appliances is largely stable.

“Mobile phones automatically adjust to the minimum power level needed to successfully connect and maintain a quality call. This allows them to operate more efficiently to preserve battery life, increase talk time and reduce network interference. Generally, the closer you are to a base station, the lower the output of the phone and studies have shown this is the most significant factor in real-life SAR levels.”

Kelly Parkinson, a SAR expert within AMTA, says a study in Paris showed the mobile was mostly operating at only 1 per cent of full power - in which case “you can be sure that the SAR will be very low”.

He says SAR is not the best measurement for safety, noting that the World Health Organisation recommends the hands-free kit as the best way to reduce emission exposure.

“For every unit of distance [the aerial is] away from your head the emission level drops off twice as much,” he says. “So distance is a very critical factor.”

For most people, this would be enough to make them comfortable with buying whichever phone takes their fancy. If, however, you’re still paranoid like me and want that lower SAR rating, you’ll need to do a bit of legwork.

Once you’ve selected your mobile provider - or have decided you don’t want to change - make a short list of phones that best suit your needs and budget. With any luck, there won’t be more than two or three different makers involved.

Websites such as SAR Shield (www.sarshield.com), which sells radiation shields for mobile phones, and the Mobile Manufacturer’s Forum (www.mmfai.org) detail the level of emissions from a wide range of phones. However, our newer mobiles take a little while to get listed on these overseas sites.

Don’t waste time on mobile phone company websites looking for SAR information. It’s usually there somewhere, but it’s faster to phone the companies direct. Nokia, for example, has a separate web address devoted to SAR results (www.sar.nokia.com/sar/index.jsp) - you select the model number and are given the details immediately. Motorola, Samsung and Sony Ericsson are also able to produce information.

For further information, see the Mobile Telephones and Health Effects page of the Australian Radiation Protection and Nuclear Safety Agency (www.arpansa.gov.au/is_phone.htm).

The gun-shaped device ingeniously allows blushing brides to effortlessly launch terrified teddy bears high into the air, and so as not to injure unsuspecting guests, the bears are equipped with parachutes, allowing them to gently descend to the presumably awestruck throng below. Such technological advancements making the company confident of success, a spokesperson proclaiming, “We’re hoping to capture the hearts of couples.”

For less romantic newlyweds however, Sunamiya’s criminal catching paintball marker could be more appropriate, a few well aimed shots at interfering relatives or lecherous uncles potentially providing far more entertainment.