> The left clip is a segment of the movie that the subject viewed while in the magnet. The right clip shows the reconstruction of this movie from brain activity measured using fMRI. The reconstruction was obtained using only each subject's brain activity and a library of 18 million seconds of random YouTube video that did not include the movies used as stimuli. Brain activity was sampled every one second, and each one-second section of the viewed movie was reconstructed separately.
Or, in other words, from a YouTube comment: > The reconstruction is built out of the Youtube video fragments that best match the brain activity of watching the movie trailer. First the subjects had to spend hours watching these videos for measuring which parts of the brain get activated. Then the movie trailer was shown and the blurry video reconstruction was created based on the measured brain activity, by combining together the 100 one-second Youtube fragments that best matched the brain activity.
Or, in other words, from a YouTube comment: > The reconstruction is built out of the Youtube video fragments that best match the brain activity of watching the movie trailer. First the subjects had to spend hours watching these videos for measuring which parts of the brain get activated. Then the movie trailer was shown and the blurry video reconstruction was created based on the measured brain activity, by combining together the 100 one-second Youtube fragments that best matched the brain activity.