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"  How Do They Do It? UC Berkeley professor Jack Gallant and his team use MRI to track blood-flow changes in a subject&amp;#039;s primary visual cortex\u2014the brain&amp;#039;s largest visual processing center\u2014as he or she watches a movie. The researchers then create a model of the visual cortex that matches the blood-flow pattern with the images the subject is viewing. Algorithms are applied to compare the brain signals with a catalog of about 5000 hours of YouTube video. The images that most accurately correspond to the brain activity are compiled into a composite video, which resembles the YouTube footage. &amp;quot;I think it&amp;#039;s very impressive that they can get these admittedly crude re-creations of our internal representations of video,&amp;quot; says Marcel Just, director of the Carnegie Mellon University Center for Cognitive Brain Imaging, who was not involved in the study. What&amp;#039;s It Good For? Such brain\u2014visual linkages could one day aid communication with stroke or coma patients. Gallant says that after his team&amp;#039;s technique is refined, it could also record and play back dreams. The obstacle to this is understanding how the brain&amp;#039;s visual processing changes when a person is sleeping or awake. Gallant is confident this will happen. &amp;quot;It&amp;#039;s only a matter of time,&amp;quot; he says.  Images are transmitted to the brain via each eye&amp;#039;s optic nerve.  A These signals are first processed in the primary visual cortex. B Scientists examine the primary visual cortex to produce images from brain activity. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/science/health/a7344/scientists-are-starting-to-read-your-mind/>