Changes in functional connectivity preserve scale-free neuronal and behavioral dynamics.
Physical review. E – November 01, 2023
Source: PubMed
Summary
Remarkably, the brain maintains its optimal information flow even when its connections significantly change. This work explored if the brain optimizes its activity, specifically how robust this tuning is to altered connections. Using the compound ibogaine, mice showed fundamentally altered brain connectivity. Yet, their characteristic brain activity patterns and movement dynamics remained largely unaffected. This indicates the brain's ability to transmit information is incredibly robust, adapting its networks to preserve optimal communication.
Abstract
Does the brain optimize itself for storage and transmission of information, and if so, how? The critical brain hypothesis is based in statistical physics and posits that the brain self-tunes its dynamics to a critical point or regime to maximize the repertoire of neuronal responses. Yet, the robustness of this regime, especially with respect to changes in the functional connectivity, remains an unsolved fundamental challenge. Here, we show that both scale-free neuronal dynamics and self-similar features of behavioral dynamics persist following significant changes in functional connectivity. Specifically, we find that the psychedelic compound ibogaine that is associated with an altered state of consciousness fundamentally alters the functional connectivity in the retrosplenial cortex of mice. Yet, the scale-free statistics of movement and of neuronal avalanches among behaviorally related neurons remain largely unaltered. This indicates that the propagation of information within biological neural networks is robust to changes in functional organization of subpopulations of neurons, opening up a new perspective on how the adaptive nature of functional networks may lead to optimality of information transmission in the brain.