1 Challenge the future Multi-scale mining of fMRI data with hierarchical structured sparsity – R. Jenatton et al, SIAM Journal of Imaging Sciences, 2012.

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Presentation transcript:

1 Challenge the future Multi-scale mining of fMRI data with hierarchical structured sparsity – R. Jenatton et al, SIAM Journal of Imaging Sciences, 2012

2 Challenge the future “Brain reading” with fMRI data n subjects, p voxels p >> n Which voxels are important?

3 Challenge the future Hierarchical clustering Voxels misaligned? Cluster voxels with spatial constraints Average feature per node of tree

4 Challenge the future Hierarchical clustering Select node and all children Dimensionality p  q = 2p - 1

5 Challenge the future Results

6 Challenge the future Results Brain people, 2010 Brain people + sparsity people, 2012

7 Challenge the future Conclusions Averaging, but not throwing away information Sparsity vs greedy selection Also for diffusion tensor imaging data?