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Japanese Group Reconstructs Visual Images from Brain Activity PatternsA Japanese research group developed the "visual image reconstruction" technology to reconstruct figures seen by a subject into images by measuring human brain activity.
The group was led by the Advanced Telecommunications Research Institute International (ATR) and National Institute of Information and Communications Technology (NICT).
By using a functional magnetic resonance imaging (fMRI) system, the new technology measures the patterns of brain activity in the cerebral visual cortex invoked by image information entered through eyes. The field of vision is divided into small areas, and the contrast in each area is estimated based on the corresponding brain activity pattern.
Visual images are reconstructed by combining the estimated contrast values. The error was reduced by combining the estimated values obtained from the assumption that the field of vision is divided in a number of different resolutions.
In the research, 440 images were presented to the subject so that the program can learn the correlation between each image and the brain activity. The image was treated as a combination of small unit elements, and the view angle of about 1° (1.7cm when seen from 1m away) was set as one pixel. The correlation between the image and the brain activity was input to the program for each of the cases where three different unit elements were used, ie, 1 pixel (row) x 2 pixels (column), 2 pixels (row) x 1 pixel (column) and 2 pixels (row) x 2 pixels (column)....dalje na
Slika i pitanju:
http://techon.nikkeibp.co.../NEWS_EN/20081212/162756/ 
