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courses:rg:predicting_human_brain_activity_associated_with_the_meanings_of_nouns [2011/09/11 00:59] ufal |
courses:rg:predicting_human_brain_activity_associated_with_the_meanings_of_nouns [2011/09/11 02:20] ufal |
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| ===== Comments ===== | ===== Comments ===== | ||
| + | ==== Summary ==== | ||
| + | * authors present a computational model, which predicts the functional magnetic resonance imaging (fMRI) of neural activation associated with words for which no fMRI data are available | ||
| + | * fMRI prediction for a word '' | ||
| + | - compute a vector of semantic features over a huge corpus | ||
| + | * 25 features are defined in terms of co-occurrence of '' | ||
| + | - predict neural fMRI activation as a weighted sum of semantic features | ||
| + | * weights for every voxel (3D pixel) and feature are estimated using multiple regression | ||
| + | * fMRI data | ||
| + | * they created 60 representative fMRI images | ||
| + | * word - picture combination from 12 semantic categories | ||
| + | * they measured brain activation of 9 participants after being exposed to all 60 word - picture combinations | ||
| + | * evaluation | ||
| + | * they carried out " | ||
| + | * 58 of them served as a training data | ||
| + | * for two of them fMRI images were predicted and compared with observed images. On the basis of cosine similarity measure a matching was determined. If the predicted image for the first word matches with its corresponding observed image, one positive point is scored - aggregated over all folds, it forms an accuracy measure | ||
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| - | ===== Suggested Additional Reading ===== | ||
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