The Vulcan characters in Star Trek were able to perform "mind melds," wordlessly passing their thoughts into the brains of other people. This year saw three demonstrations of mind melding, although the information transmitted was simple motor commands. In February, Duke University researchers reported they had linked the brains of two pairs of lab rats. When the first rat pressed one of two levers, either right or left, an electrode in its cortex picked up a signal. The researchers converted that signal to a set of pulses, which were transmitted over the Internet to an electrode implanted in the cortex of the second rat. That animal, already trained to differentiate between the two types of pulses, pressed one lever or another depending upon the signal it received. The receiving rat chose the correct lever 64 percent of the time - not perfect, but better than if the rat had flipped a coin. Then Harvard University neuroscientists reported in April that people wired up to electroencephalography (EEG) devices had interfaced with rats. A person's brain waves were converted to an ultrasound pulse, which was transmitted to a specific section of the rat's motor cortex, causing its tail to swish.
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