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. Author manuscript; available in PMC: 2019 Dec 3.
Published in final edited form as: Hum Brain Mapp. 2019 May 21;40(13):3860–3880. doi: 10.1002/hbm.24636

FIGURE 5.

FIGURE 5

(a) Representations of different cortical attributes using their corresponding dictionaries DMj(vi) (jϵ{A,C,D,G,T,L}) and sparse representation vectors ωj (jϵ{A,C,D,G,T,L}). (b) Multitask sparse representation using the dirty model. W contains all sparse representation vectors [ωj] for all cortical attributes, and it is composed of two matrices, P and Q. The matrix P is imposed with group-wise sparsity, to ensure sharing of similar sparsity structure for different cortical attributes. The matrix Q is imposed with element-wise sparsity