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Combining Behavior and EEG to Study the Effects of Mindfulness Meditation on Episodic Memory

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Mind-to-mind heteroclinic coordination: Model of sequential episodic memory initiation.

V S Afraimovich¹, M A Zaks², M I Rabinovich³

¹Instituto de Investigación en Comunicación Óptica, Universidad Autónoma de San Luis Potosí, 78220 San Luis Potosí, Mexico.

Chaos (Woodbury, N.Y.)

|June 3, 2018

Summary

This study models how groups form shared episodic memories. It reveals a stable dynamical process, a nonsmooth heteroclinic torus, enabling memory formation and modification through coupled neural activity.

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Area of Science:

Cognitive Neuroscience
Dynamical Systems Theory
Computational Psychiatry

Background:

Episodic memory retrieval is a complex dynamical process within large-scale brain networks.
In social groups, shared experiences lead to encoded, recalled, and shared neural patterns among participants.

Purpose of the Study:

To construct and analyze a dynamical model for the formation and maintenance of episodic memory in interacting individuals.
To investigate the stability and characteristics of the underlying neural dynamics.

Main Methods:

Development of a dynamical model for episodic memory in small ensembles of interacting minds.
Analysis of the model using Lotka-Volterra-like equations to identify attractors.
Characterization of dynamics using length-related Lyapunov exponents.

Main Results:

Identification of a structurally stable, unconventional dynamical attractor: a nonsmooth heteroclinic torus.
Demonstration that dynamics on this torus exhibit an absence of chaos but asymptotic instability of individual trajectories.
Observation of sequential switching between metastable states, dependent on coupling strength, interpreted as memory formation stages.

Conclusions:

The nonsmooth heteroclinic torus provides a robust mechanism for the formation and modification of shared episodic memories in social groups.
Coupling strength critically influences the dynamics, leading to distinct phases of memory development.
This model offers insights into the collective neural processes underlying social memory.