Lausanne Parcellation
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The Lausanne Parcellation is a workflow that subdivides the 30+ general brain regions into many smaller partitions of approximately equal size. This gives us a finer-grained partitioning of the cortex. Because they are smaller, these partitions are more likely to behave relatively more homogeneously during a particular task. Becaues they are of comparable size, it is more justifiable to weight them equally in your analyses.
The Lausanne 2008 parcellation scheme refers to the 2008 PLoS Biology Paper Mapping the Structural Core of Human Cerebral Cortex