We define a functional area of unitary pooled activity (FAUPA) as an area in which the temporal variation of the activity is the same across the entire area, i.e., the pooled activity is a dynamically unitary activity. This unitary activity across the FAUPA implies a perfect temporal correlation for the activity-induced BOLD response, i.e., the Pearson correlation coefficient is 1 for the BOLD responses of any two locations within the FAUPA. A FAUPA may play the role of a functional unit at large-scale. We report the identification of FAUPAs for both resting-state and task fMRI.
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