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According to this CNN article, Sony has been granted a patent on a brain-computer interface that uses ultrasonic pulses to alter timing within the brain. Since the brain’s neural network exploits its own innate timing to perform calculations, it should theoretically be possible to introduce data into the brain by modifying that timing. The techology, for which no experiments have yet been conducted, would be non-invasive. It’ll be interesting to see if they can get this to work without damaging the neural net in the process.