Banca de DEFESA: THAIS FELICIANO SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : THAIS FELICIANO SILVA
DATE: 30/11/2023
TIME: 09:00
LOCAL: Através de Videoconferência: https://meet.google.com/irx-jejm-bhd
TITLE:

Multiple signatures of criticality explored on V1 neuronal activity

KEY WORDS:

Criticality. Neuronal avalhanches. Maximal Entropy models. Cortical states. Complexity
measures. Rat’s Primary Visual Cortex. Silicon Probe.

PAGES: 105
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

The hypothesis that the brain self-organizes around a critical point has been under investigation
for nearly three decades. This notion posits that extensive neuronal populations
can be effectively examined as many-body systems, characterized by principles from statistical
physics. According to this analogy, a system near this critical point exhibits certain functional
advantages, and the brain already exhibits these characteristics, providing support for the
concept of brain criticality. In other contexts, critical point analysis typically explores the transitions
between various phases or states of a system, yet the application of this analysis to the
dynamics of the brain has remained relatively underexplored. In this study, we propose the evaluation
of three distinct signatures of criticality for different cortical states. We define different
cortical states based on the level of variability in neuronal population activity, which is closely
associated with the degree of synchrony among neurons. The criticality indicators demonstrate
greater significance during moments characterized by intermediate levels of synchronization
among the neuronal population, as recorded using silicon probes in the visual cortex of anesthetized
rats. These findings invigorate inquiries into fundamental questions, such as: ’If the
brain’s dynamics indeed self-organize around a critical point, which brain phases are linked
to this transition? Is the level of synchrony in neuronal population activity a suitable order
parameter for characterizing the phase transition associated with the critical point?

COMMITTEE MEMBERS:
Interno - 2298925 - CLECIO CLEMENTE DE SOUZA SILVA
Externa à Instituição - FERNANDA SELINGARDI MATIAS - UFAL
Externo à Instituição - MARCELO BUSSOTTI REYES - UFABC
Presidente - 1801584 - PEDRO VALADAO CARELLI
Interno - 2378411 - RENE RODRIGUES MONTENEGRO FILHO