Zobrazeno 1 - 10
of 270
pro vyhledávání: '"Copelli, Mauro"'
We apply the phenomenological renormalization group to resting-state fMRI time series of brain activity in a large population. By recursively coarse-graining the data, we compute scaling exponents for the series variance, log probability of silence,
Externí odkaz:
http://arxiv.org/abs/2411.09098
Autor:
Cambrainha, Gustavo G., Castro, Daniel M., de Vasconcelos, Nivaldo A. P., Carelli, Pedro, Copelli, Mauro
The critical brain hypothesis posits that neural systems operate near a phase transition, optimising the transmission, storage, and processing of information. While scale invariance and non-Gaussian dynamics - hallmarks of criticality - have been obs
Externí odkaz:
http://arxiv.org/abs/2410.23508
Autor:
Jungmann, Rafael M., Feliciano, Thaís, Aguiar, Leandro A. A., Soares-Cunha, Carina, Coimbra, Bárbara, Rodrigues, Ana João, Copelli, Mauro, Matias, Fernanda S., de Vasconcelos, Nivaldo A. P., Carelli, Pedro V.
The local field potential (LFP) is as a measure of the combined activity of neurons within a region of brain tissue. While biophysical modeling schemes for LFP in cortical circuits are well established, there is a paramount lack of understanding rega
Externí odkaz:
http://arxiv.org/abs/2312.07286
The Wilson-Cowan model constitutes a paradigmatic approach to understanding the collective dynamics of networks of excitatory and inhibitory units. It has been profusely used in the literature to analyze the possible phases of neural networks at a me
Externí odkaz:
http://arxiv.org/abs/2301.06839
Autor:
Porta, Leonardo Dalla, Castro, Daniel M., Copelli, Mauro, Carelli, Pedro V., Matias, Fernanda S.
Several studies with brain signals suggested that bottom-up and top-down influences are exerted through distinct frequency bands among visual cortical areas. It has been recently shown that theta and gamma rhythms subserve feedforward, whereas the fe
Externí odkaz:
http://arxiv.org/abs/2106.05783
The critical brain hypothesis states that there are information processing advantages for neuronal networks working close to the critical region of a phase transition. If this is true, we must ask how the networks achieve and maintain this critical s
Externí odkaz:
http://arxiv.org/abs/2010.10622
Autor:
Lotfi, Nastaran, Feliciano, Thaís, Aguiar, Leandro A. A., Silva, Thais Priscila Lima, Carvalho, Tawan T. A., Rosso, Osvaldo A., Copelli, Mauro, Matias, Fernanda S., Carelli, Pedro V.
Publikováno v:
Phys. Rev. E 103, 012415 (2021)
Complex systems are typically characterized as an intermediate situation between a complete regular structure and a random system. Brain signals can be studied as a striking example of such systems: cortical states can range from highly synchronous a
Externí odkaz:
http://arxiv.org/abs/2010.04123
Autor:
Carlos, Francisco-Leandro P., Ubirakitan, Maciel-Monteiro, Rodrigues, Marcelo Cairrão Araújo, Aguilar-Domingo, Moisés, Herrera-Gutiérrez, Eva, Gómez-Amor, Jesús, Copelli, Mauro, Carelli, Pedro V., Matias, Fernanda S.
Understanding the functional connectivity of the brain has become a major goal of neuroscience. In many situatons, the relative phase difference, together with coherence patterns, have been employed to infer the direction of the information flow. How
Externí odkaz:
http://arxiv.org/abs/2008.11167
Autor:
Carvalho, Tawan T. A., Fontenele, Antonio J., Girardi-Schappo, Mauricio, Feliciano, Thais, Aguiar, Leandro A. A., Silva, Thais P. L., de Vasconcelos, Nivaldo A. P., Carelli, Pedro V., Copelli, Mauro
Publikováno v:
Front. Neural Circuits 14, 83 (2021)
Recent experimental results on spike avalanches measured in the urethane-anesthetized rat cortex have revealed scaling relations that indicate a phase transition at a specific level of cortical firing rate variability. The scaling relations point to
Externí odkaz:
http://arxiv.org/abs/2007.13813
Autor:
Lotfi, Nastaran, Fontenele, Antonio J., Feliciano, Thaís, Aguiar, Leandro A. A., de Vasconcelos, Nivaldo A. P., Soares-Cunha, Carina, Coimbra, Bárbara, Rodrigues, Ana João, Sousa, Nuno, Copelli, Mauro, Carelli, Pedro V.
Publikováno v:
Phys. Rev. E 102, 012408 (2020)
It has recently been reported that statistical signatures of brain criticality, obtained from distributions of neuronal avalanches, can depend on the cortical state. We revisit these claims with a completely different and independent approach, employ
Externí odkaz:
http://arxiv.org/abs/2001.11080