Episodic memory: mental time travel or a quantum `memory wave' function?

Manning, Jeremy R.

doi:10.31234/osf.io/6zjwb

Cited by 6 publications

(6 citation statements)

References 48 publications

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“…Additionally, cognitive context information evident in CA23DG activity patterns varied over a coarse timescale, such that pattern similarity was highest for pairs of items that were associated with similar temporal and cognitive contexts. Collectively, these findings demonstrate that the hippocampus represents information about past events in a manner that is consistent with temporal context models (Howard et al, 2014; Howard & Kahana, 2002; Manning, 2019; Norman et al, 2008; Polyn et al, 2009; Ranganath, 2019; Sederberg et al, 2008; Shankar & Howard, 2010, 2012).…”

Section: Discussionsupporting

confidence: 64%

Representations of complex contexts: A role for hippocampus

Dimsdale-Zucker

Montchal

Reagh

et al. 2019

Preprint

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The hippocampus plays a critical role in supporting episodic memory. 7Although we know that temporal context is a defining feature of episodic memory, we 8understand relatively little about how this information may be represented by the 9 hippocampus. Research in rodents has suggested that the hippocampus represents 10 temporal information on an absolute scale or in terms of relative temporal intervals, but 11 cognitive models of memory have argued that temporal context in episodic memory is a 12 consequence of changes in cognitive states and experiences. Here, we combined high-13resolution fMRI imaging with voxel pattern similarity analyses to answer the question of 14 how human hippocampal subfields represent retrieved information about cognitive 15 states and the time at which a past event took place. As participants recollected 16 previously presented items, activity patterns in the CA23DG subregion carried 17 information about prior cognitive states, along with coarse-grained information about 18 when the item was previously encountered. These findings are consistent with the idea 19

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Section: Discussionsupporting

confidence: 64%

Representations of complex contexts: A role for hippocampus

Dimsdale-Zucker

Montchal

Reagh

et al. 2019

Preprint

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“…One approach is to start by considering some fundamental properties of the dynamics of our experiences. Each given moment of an experience tends to derive meaning from surrounding moments, as well as from longer-range temporal associations (Lerner et al, 2011;Manning, 2019Manning, , 2020. Therefore, the timecourse describing how an event unfolds is fundamental to its overall meaning.…”

Section: Introductionmentioning

confidence: 99%

Geometric models reveal behavioural and neural signatures of transforming experiences into memories

2021

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The mental contexts in which we interpret experiences are often person-specific, even when the experiences themselves are shared. We developed a geometric framework for mathematically characterizing the subjective conceptual content of dynamic naturalistic experiences. We model experiences and memories as trajectories through word embedding spaces whose coordinates reflect the universe of thoughts under consideration. Memory encoding can then be modeled as geometrically preserving or distorting the shape of the original experience. We applied our approach to data collected as participants watched and verbally recounted a television episode while undergoing functional neuroimaging. Participants' recountings all preserved coarse spatial properties (essential narrative elements), but not fine spatial scale (low-level) details, of the episode's trajectory. We also identified networks of brain structures sensitive to these trajectory shapes. Our work provides insights into how we preserve and distort our ongoing experiences when we encode them into episodic memories.

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Section: Introductionmentioning

confidence: 99%

Geometric models reveal behavioral and neural signatures of transforming naturalistic experiences into episodic memories

Heusser

Fitzpatrick

Manning

2018

Preprint

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How our experiences unfold over time define unique trajectories through the relevant representational spaces. Within this geometric framework, one can compare the shape of the trajectory formed by an experience to that defined by our later remembering of that experience. We propose a framework for mapping naturalistic experiences onto geometric spaces that characterize how they unfold over time. We apply this approach to a naturalistic memory experiment which had participants view and recount a video. We found that the shapes of the trajectories formed by participants' recountings were all highly similar to that of the original video, but participants differed in the level of detail they remembered. We also identified a network of brain structures that are sensitive to the "shapes" of our ongoing experiences, and an overlapping network that is sensitive to how we will later remember those experiences.

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Episodic memory: mental time travel or a quantum `memory wave' function?

Cited by 6 publications

References 48 publications

Representations of complex contexts: A role for hippocampus

Representations of complex contexts: A role for hippocampus

Geometric models reveal behavioural and neural signatures of transforming experiences into memories

Geometric models reveal behavioral and neural signatures of transforming naturalistic experiences into episodic memories

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