Multivoxel Pattern Analysis for fMRI Data: A Review
Figure 6
2D illustration of the “searchlight” method on simulated maps of pixels. For each pixel in the activity map, 5 neighbors (a searchlight) are extracted to form a feature vector. Extracted searchlights from the activity maps of each condition ( or ) form then the input examples. A classifier is trained using training examples (corresponding to the 3 first runs) and tested using the examples of the fourth run. The procedure is then repeated along the activity maps for each pixel to produce finally a performance map that shows how well the signal in the local neighborhoods differentiates the experimental conditions and .
