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- Title
Further results on why a point process is effective for estimating correlation between brain regions.
- Authors
Cifre, I.; Zarepour, M.; Horovitz, S. G.; Cannas, S. A.; Chialvo, D. R.
- Abstract
Signals from brain functional magnetic resonance imaging (fMRI) can be efficiently rep- resented by a sparse spatiotemporal point process, according to a recently introduced heuristic signal processing scheme. This approach has already been validated for relevant conditions, demonstrating that it preserves and compresses a surprisingly large fraction of the signal information. Here we investigated the conditions necessary for such an approach to succeed, as well as the underlying reasons, using real fMRI data and a simulated dataset. The results show that the key lies in the temporal correlation properties of the time series under consideration. It was found that signals with slowly decaying autocorrelations are particularly suitable for this type of compression, where inection points contain most of the information.
- Subjects
POINT processes; FUNCTIONAL magnetic resonance imaging; SPATIOTEMPORAL processes; TIME series analysis; SIGNAL processing; DATA compression
- Publication
Papers in Physics, 2020, Vol 12, p1
- ISSN
1852-4249
- Publication type
Article
- DOI
10.4279/PIP.120003