Sparsity and the brain

Detection of Cognitive States by functional MRI (fMRI): The investigators have shown that human cognitive states, such as craving, visual thinking, pain, belief or disbelief, can be detected accurately by considering the contribution from a sparse number of connected networks in the brain. In this figure, different cognitive states can be considered as having separate location in a three dimensional space that indicates the contribution from each of three brain networks. Sparse analysis was able also to detect the whole brain networks used to identify the cognitive states. (Image courtesy of M.S. Cohen)

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