Hippocampal hierarchical networks for space, time, and memory

Collin, Silvy; Milivojevic, Branka; Doeller, Christian F.

doi:10.1016/j.cobeha.2017.06.007

Cited by 29 publications

(32 citation statements)

References 70 publications

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“…Similarly to the jargon based on conventional Lyapunov exponents where presence of two and more positive LE is called "hyperchaos", here we can speak of Fig. 7c, the larger one stems from the y-subsystem of the equations (5,6) whereas the smaller one is related to the intrinsic dynamics of the x-subsystem.…”

Section: B Measuring the Instability Ratesmentioning

confidence: 99%

“…Denote it by R 3 1 . This plane is invariant for ε = 0 both for the system (7,8) and (5,6). Inside R 3 1 the point O 33 = (σ 1 , 0, δ 3 ) is the saddle equilibrium point for the system (7,8) This trajectory belongs to the three-dimensional invariant plane x 2 = 0, y 1 = y 2 = 0, say R 3 2 .…”

Section: Saddlementioning

confidence: 99%

“…11. Projections of the phase portrait of the system (5,6,14) at p = 0.05, ε = 10 −18 . y 1 and y 3 completely decay (numerically both of them attain the value of ε).…”

Section: Transformations In the Phase Spacementioning

confidence: 99%

“…Notably, episodic memories are not exact replicas of the lives: rather, they are organized summaries of experience, encoded in the form of sequential groups of events 3 . According to recent imaging data, the brain areas responsible for storage and retrieval of episodic memories include hippocampus, striatum and the prefrontal cortex 4,5 .…”

mentioning

confidence: 99%

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

Afraimovich

Zaks

Rabinovich

2018

Chaos: An Interdisciplinary Journal of Nonlinear Science

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Retrieval of episodic memory is a dynamical process in the large scale brain networks. In social groups, the neural patterns, associated with specific events directly experienced by single members, are encoded, recalled, and shared by all participants. Here, we construct and study the dynamical model for the formation and maintaining of episodic memory in small ensembles of interacting minds. We prove that the unconventional dynamical attractor of this process-the nonsmooth heteroclinic torus-is structurally stable within the Lotka-Volterra-like sets of equations. Dynamics on this torus combines the absence of chaos with asymptotic instability of every separate trajectory; its adequate quantitative characteristics are length-related Lyapunov exponents. Variation of the coupling strength between the participants results in different types of sequential switching between metastable states; we interpret them as stages in formation and modification of the episodic memory.

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Section: B Measuring the Instability Ratesmentioning

confidence: 99%

Section: Saddlementioning

confidence: 99%

“…11. Projections of the phase portrait of the system (5,6,14) at p = 0.05, ε = 10 −18 . y 1 and y 3 completely decay (numerically both of them attain the value of ε).…”

Section: Transformations In the Phase Spacementioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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

Afraimovich

Zaks

Rabinovich

2018

Chaos: An Interdisciplinary Journal of Nonlinear Science

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“…to get some water) is at a faster, more fine-grained time scale and last only a few seconds. This principled idea to represent behaviour as a hierarchy of sequences has also been proposed as a way how one may understand recent findings in fields such as speech (Hasson et al 2008), memory and the hippocampus (Collin, Milivojevic, and Doeller 2017), and decision making (Hunt and Hayden 2017). Note that the principled idea that goal-directed control is organised as a hierarchy with elements represented at different time scales can be traced back to concepts outlined for example by Miller, Galanter, and Pribram (1960) and pursued in action control theories (Gollwitzer and Bargh 1996;Heckhausen and Kuhl 1985;Kuhl and Goschke 1994).…”

Section: Uncertainty and A Hierarchy Of Time Scalesmentioning

confidence: 99%

Meta-control of the exploration-exploitation dilemma emerges from probabilistic inference over a hierarchy of time scales

Marković

Goschke

Kiebel

2019

Preprint

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Cognitive control is typically understood as a set of mechanisms which enable humans to reach goals that require integrating the consequences of actions over longer time scales. Importantly, using routine beheavior or making choices beneficial only at a short time scales would prevent one from attaining these goals. During the past two decades, researchers have proposed various computational cognitive models that successfully account for behaviour related to cognitive control in a wide range of laboratory tasks. As humans operate in a dynamic and uncertain environment, making elaborate plans and integrating experience over multiple time scales is computationally expensive, the specific question of how uncertain consequences at different time scales are integrated into adaptive decisions remains poorly understood. Here, we propose that precisely the problem of integrating experience and forming elaborate plans over multiple time scales is a key component for better understanding how human agents solve cognitive control dilemmas such as the exploration-exploitation dilemma. In support of this conjecture, we present a computational model of probabilistic inference over hidden states and actions, which are represented as a hierarchy of time scales. Simulations of goal-reaching agents instantiating the model in an uncertain and dynamic task environment show how the exploration-exploitation dilemma may be solved by inferring meta-control states which adapt behaviour to changing contexts.

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The contributions of spatial context and imagery to the recollection of single words

2019

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A number of theories of hippocampal function have placed spatial context at the center of richly recollected memories, but the subjective and objective ways that spatial context underlies the recollection of single words has been largely overlooked and underexplained. In this study, we conducted three experiments to investigate the involvement of spatial context in the recollection of single words. In all three experiments, participants encoded single words with varying features such as location and color. The subjective experience of recollection was measured using remember/know judgments and participant self‐report of the types of information they recollected about the words. Objectively, recollection was measured using source memory judgments for both spatial and non‐spatial features associated with the words. Our results provide evidence that spatial context frequently accompanies the recollection of single, isolated words, reviving discussions on the role of the hippocampus in spatial and detailed recollection.

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Hippocampal hierarchical networks for space, time, and memory

Cited by 29 publications

References 70 publications

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

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

Meta-control of the exploration-exploitation dilemma emerges from probabilistic inference over a hierarchy of time scales

The contributions of spatial context and imagery to the recollection of single words

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