Update README.md

README.md

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 license: odbl
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+There are 3 main “MindBigData” databases: 
+1.- “The MNIST of Brain Digits” for EEG signals with several headsets captured while looking at “font” based digits shown in a screen from 0 to 9.  
+2.- “The ImageNet of the Brain” for EEG signals captured while looking at ImageNet images. 
+3.- “The Visual MNIST of Brain Digits” for EEG signals captured while looking at the original MNIST handwritten digits (real pixels) shown in a screen also from 0 to 9.  
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