Multiple signatures of criticality explored on V1 neuronal activity

Detalhes bibliográficos
Ano de defesa: 2023
Autor(a) principal: SILVA, Thaís Feliciano
Orientador(a): CARELLI, Pedro Valadão
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: eng
Instituição de defesa: Universidade Federal de Pernambuco
Programa de Pós-Graduação: Programa de Pos Graduacao em Fisica
Departamento: Não Informado pela instituição
País: Brasil
Palavras-chave em Português:
Link de acesso: https://repositorio.ufpe.br/handle/123456789/54692
Resumo: The hypothesis that the brain self-organizes around a critical point has been under in- vestigation 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 func- tional 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 syn- chronization among the neuronal population, as recorded using silicon probes in the visual cortex of anesthetized rats. These findings reinforce investigations into fundamental questions such as the self-organization of brain dynamics around a critical point between assumed brain states and also into the use of synchrony levels in neuronal population activity as an order parameter for a transition associated with the critical point.