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Robust sequential working memory recall in heterogeneous cognitive networks.

Mikhail I Rabinovich1, Yury Sokolov2, Robert Kozma2

  • 1BioCircuits Institute, University of California San Diego La Jolla, CA, USA.

Frontiers in Systems Neuroscience
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Psychiatric disorders disrupt sequential and spatial working memory (SWM) due to altered neural network dynamics. This study reveals "clustered sequential dynamics" where normal memory recall is intermittently interrupted by chaotic episodes.

Keywords:
cognitive dynamicscomplex networksheteroclinic chimerasinhibitionmemory disorderssequential intermittency

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Area of Science:

  • Computational Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • Psychiatric disorders are linked to disruptions in cognitive networks controlling sequential and spatial working memory (SWM).
  • Altered dynamic connectivity within neural networks can lead to impaired SWM capacity.
  • Understanding these network dynamics is crucial for addressing cognitive deficits.

Purpose of the Study:

  • To investigate the bifurcations of sequential memory dynamics in recurrent inhibitory-excitatory networks.
  • To analyze the phenomenon of clustered sequential dynamics in models with heterogeneous inhibition.
  • To explore potential dynamic mechanisms for augmenting damaged working memory.

Main Methods:

  • Modeling recurrent inhibitory-excitatory neural networks with heterogeneous inhibition.
  • Utilizing computer experiments to observe network dynamics.
  • Analyzing Lyapunov exponents to characterize dynamic behaviors.

Main Results:

  • Observed and analyzed a novel phenomenon termed "clustered sequential dynamics."
  • Identified two weakly interacting quasi-attractors in the model's phase space: a regular SWM representation and a quasi-chaotic attractor.
  • Demonstrated that clustered sequential dynamics results in intermittent interruptions of normal information recall by chaotic episodes.

Conclusions:

  • Clustered sequential dynamics, explained by the winnerless competition principle, underlies intermittent memory recall failures.
  • The coexistence of regular and chaotic attractors provides a dynamical explanation for impaired SWM in certain conditions.
  • Findings suggest potential dynamical interventions for enhancing cognitive functions like working memory.