Telepathic control of another personís body is a small step closer. By linking the technologies of two brain/computer interfaces, human volunteers were able to trigger movement in a ratís tail using their minds.
Recently, researchers linked the brains of two rats so that they worked together to accomplish a task. Such techniques are unlikely to be applied to humans any time soon because they require invasive surgery to implant electrodes into the brain.
Now Seung-Schik Yoo of Harvard Medical School in Boston and colleagues have created a system that connects a human to a rat via a computer, without the need for the human or the rat to have brain implants.
The human volunteers wore electrode caps that monitored their brain activity using electroencephalography (EEG). Meanwhile, an anaesthetised rat was hooked up to a device that made the creatureís neurons fire whenever it delivered an ultrasonic pulse to the ratís motor cortex.
When monitoring the humanís brain activity, the researchers looked for a specific EEG pattern known to correspond to visual stimulation. As the volunteers watched a strobe light blinking on a computer screen, the EEG wave synchronised to match the frequency of the strobe (see the "SSVEP" line on video, above).
But when they switched to concentrating on moving the ratís tail, the change in their focus disrupted the EEG, triggering a signal to be sent to the computer. The computer translated this signal into an ultrasonic pulse, which stimulated the ratís motor cortex, causing its tail to move. Using this system, all six of the volunteers were able to trigger movement in the ratís tail with little difficulty.
Yoo says it should be possible for two humans to use a similar system in the foreseeable future. Such a system could, for instance, be used to help a paralysed person relearn to use their limbs by having their therapist initially move them with their mind.
But Ricardo Chavarriaga at the Swiss Federal Institute of Technology (EPFL) in Lausanne and others say that while the experiment is an interesting application of the two technologies, linking them together does not reveal much about the ability to link two brains.
Because the rat was anaesthetised to isolate the effect of the intervention, he says it is not clear that the experiment realistically models what would happen if a conscious brain was stimulated this way.
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