The mentioned article is "Visual Image Reconstruction from Human Brain Activity using a Combination of Multiscale Local Image Decoders", at:
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WSS-4V4113M-P&_user=10&_coverDate=12%2F10%2F2008&_rdoc=1&_fmt=high&_orig=browse&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=60109659c821eb5cf7bce5afe963cf44 and http://www.scribd.com/doc/8857889/Visual-Image-Reconstruction-from-Human-Brain-Activity-using-a-Combination-of-Multiscale-Local-Image-Decoders SUMMARY Perceptual experience consists of an enormous number of possible states. Previous fMRI studies have predicted a perceptual state by classifying brain activity into prespecified categories. Constraint-free visual image reconstruction is more challenging, as it is impractical to specify brain activity for all possible images. In this study, we reconstructed visual images by combining local image bases of multiple scales, whose contrasts were independently decoded from fMRI activity by automatically selecting relevant voxels and exploiting their correlated patterns. Binarycontrast, 103 10-patch images (2^100 possible states) were accurately reconstructed without any image prior on a single trial or volume basis by measuring brain activity only for several hundred random images. Reconstruction was also used to identify the presented image among millions of candidates. The results suggest that our approach provides an effective means to read out complex perceptual states from brain activity while discovering information representation in multivoxel patterns. -- []´s Acilio. On Fri, Dec 12, 2008 at 2:07 AM, Robert Swaine <[email protected]>wrote: > fMRI scanner reconstructing images seen by subjects, etc > > http://www.yomiuri.co.jp/dy/features/science/20081211TDY01306.htm > copied below - Anyone read the actual article in "Neuron"? > > > ////////////////////////////////////////////////////////////////// > Images read from human brain > The Yomiuri Shimbun > > OSAKA--In a world first, a research group in Kyoto Prefecture has succeeded > in processing and displaying optically received images directly from the > human brain. > > The group of researchers at Advanced Telecommunications Research Institute > International, including Yukiyasu Kamitani and Yoichi Miyawaki, from its > NeuroInformatics Department, said about 100 million images can be read, > adding that dreams as well as mental images are likely to be visualized in > the future in the same manner. > > The research will be published Thursday in the U.S. scientific journal > "Neuron." > > Optically received images are converted to electrical signals in the retina > and treated in the brain's visual cortex. > > In the recent experiment, the research group asked two people to look at > 440 different still images one by one on a 100-pixel screen. Each of the > images comprised random gray sections and flashing sections. > > The research group measured subtle differences in brain activity patterns > in the visual cortexes of the two people with a functional magnetic > resonance imaging (fMRI) scanner. They then subdivided the images and > recorded the subjects' recognition patterns. > > The research group later measured the visual cortexes of the two people who > were looking at the word "neuron" and five geometric figures such as a > square and a cross. Based on the stored brain patterns, the research group > analyzed the brain activities and reconstructed the images of Roman letters > and other figures, succeeding in recreating optically received images. > > (Dec. 11, 2008) > > > ------------------------------------------- > agi > Archives: https://www.listbox.com/member/archive/303/=now > RSS Feed: https://www.listbox.com/member/archive/rss/303/ > Modify Your Subscription: > https://www.listbox.com/member/?&; > Powered by Listbox: http://www.listbox.com > ------------------------------------------- agi Archives: https://www.listbox.com/member/archive/303/=now RSS Feed: https://www.listbox.com/member/archive/rss/303/ Modify Your Subscription: https://www.listbox.com/member/?member_id=8660244&id_secret=123753653-47f84b Powered by Listbox: http://www.listbox.com
