Further results on why a point process is effective for estimating correlation between brain regions

Papers in Physics

D. R.Chialvo¹  I. Cifre²  S. A. Cannas³  M. Zarepour³  S. G.Horowitz⁴ 

[1] Center for Complex Systems & Brain Sciences (CEMSC 3), Universidad Nacional de San Martín, 25 de Mayo 1169, San Martín, (1650), Buenos Aires, Argentina.;Facultat de Psicologia, Ciències de l'educació i de l'Esport, Blanquerna, Universitat Ramon Llull, C. Císter 34. Barcelona, (08022), Spain.;Instituto de Física Enrique Gaviola (IFEG), Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Ciudad Universitaria, (5000), Córdoba, Argentina.;National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.;

关键词: time series;    point processes;    functional connectivity;    resting states;    dynamics;   

DOI  :  10.4279/pip.120003

来源: DOAJ

【 摘 要 】

Signals from brain functional magnetic resonance imaging (fMRI) can be efficiently represented 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 inflection points contain most of the information.

【 授权许可】

Unknown