Locating Decision-Making Circuits in a Heterogeneous Neural Network

Emerson Arehart, Tangxin Jin, Bryan C. Daniels

Research output: Contribution to journalArticlepeer-review

Abstract

In the process of collective decision-making, many individual components exchange and process information until reaching a well-defined consensus state. Existing theory suggests two phases to this process. In the first, individual components are relatively free to wander between decision states, remaining highly sensitive to perturbations; in the second, feedback between components brings all or most of the collective to consensus. Here, we extend an existing model of collective neural decision-making by allowing connection strengths between neurons to vary, moving toward a more realistic representation of the large variance in the behavior of groups of neurons. We show that the collective dynamics of such a system can be tuned with just two parameters to be qualitatively similar to a simpler, homogeneous case, developing tools for locating a pitchfork bifurcation that can support both phases of decision-making. We also demonstrate that collective effects cause large and long-lived sensitivity to decision input at the transition, which connects to the concept of phase transitions in statistical physics. We anticipate that this theoretical framework will be useful in building more realistic neuronal-level models for decision-making.

Original languageEnglish (US)
Article number11
JournalFrontiers in Applied Mathematics and Statistics
Volume4
DOIs
StatePublished - May 9 2018

Keywords

  • Fisher information
  • collective decisions
  • cusp bifurcation
  • phase transitions
  • pitchfork bifurcation
  • symmetry breaking

ASJC Scopus subject areas

  • Applied Mathematics
  • Statistics and Probability

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