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Movie reconstructions from human brain activity: 3 subjects

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Uploaded on Sep 21, 2011

For an explanation of the procedure please see the other video on this channel: http://www.youtube.com/watch?v=nsjDnY...
This video is organized as follows: the movie that each subject viewed while in the magnet is shown at upper left. Reconstructions for three subjects are shown in the three rows at bottom. All these reconstructions were 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. (In brief, the algorithm processes each of the 18 million clips through the brain model, and identifies the clips that would have produced brain activity as similar to the measured activity as possible. The clips used to fit the model, the clips used to test the model and the clips used to reconstruct the stimulus were entirely separate.) The reconstruction at far left is the Average High Posterior (AHP). The reconstruction in the second column is the Maximum a Posteriori (MAP). The other columns represent less likely reconstructions. The AHP is obtained by simply averaging over the 100 most likely movies in the reconstruction library. These reconstructions show that the process is very consistent, though the quality of the reconstructions does depend somewhat on the quality of brain activity data recorded from each subject.
For the paper (Nishimoto et al., 2011, Current Biology) go to: http://dx.doi.org/10.1016/j.cub.2011....
You can find more information about this work at our laboratory web site: http://gallantlab.org

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