Aberrant neural event segmentation during a continuous social narrative in trauma-exposed older adolescents and young adults

Cognitive Affective & Behavioral Neuroscience, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

Language: Английский

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Event segmentation promotes the reorganization of emotional memory

Published: May 16, 2024

Event boundaries help structure the content of episodic memories by segmenting continuous experiences into discrete events. may also serve to preserve meaningful information within an event, thereby actively separating important from interfering representations imposed past and future Here, we tested hypothesis that event organize emotional memory based on changing dynamics as events unfold. We developed a novel threat-reversal learning task whereby participants encoded trial-unique exemplars two semantic categories across three phases: preconditioning, fear-acquisition, reversal. Shock contingencies were established for one category during acquisition (CS+) then switched other reversal (CS-). Importantly, was either separated perceptible boundary (experiment 1) or occurred immediately after acquisition, with no context shift 2). In surprise recognition test next day, performance tracked contingences encoding in experiment 1, such selectively recognized more threat-associated CS+ before (retroactive) but this pattern reversed toward CS- By contrast, encoding—without between conditioning reversal—exhibited undifferentiated both following Further analyses highlight nuanced effects reversing conditioned fear, updating mnemonic generalization, biasing temporal source memory. These findings suggest provide anchor points distinctly information, adaptively structuring our experiences.

Language: Английский

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Priors, Evidence, and Memory: Dynamics of Predictive Processing (POEM)

Neuroscience & Biobehavioral Reviews, Journal Year: 2025, Volume and Issue: unknown, P. 106137 - 106137

Published: April 1, 2025

Language: Английский

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Generating event boundaries in memory without prediction error

Published: June 13, 2024

Continuous experiences are segmented into discrete long-term memories through the generation of event boundaries. A leading theory segmentation proposes that boundaries triggered by prediction errors caused unexpected stimuli. However, recent studies have raised doubts about whether error is necessary for segmentation. In this study, we tested an alternative account: in memory reflect temporal structure working during perception and can occur even absence error. experiment 1, participants were asked to detect repeats within sequences random images. The switch a new sequence could be predictable, with continuous display number images remaining each sequence, or unpredictable, no prior indication was end. We found boundary-related effects on order both cases, higher accuracy within-sequence comparisons when boundary between predictable. experiments 2a 2b, always performed either (event-related) repeat-detection task from 1 (non-event-related) 2-back task. observed event-boundary only event-related. Both these support segmentation, which critically related dynamics rather than

Language: Английский

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Effects of context changes on memory reactivation

Journal of Neuroscience, Journal Year: 2024, Volume and Issue: 44(36), P. e2096232024 - e2096232024

Published: Aug. 5, 2024

While the influence of context on long-term memory (LTM) is well documented, its effects interaction between working (WM) and LTM remain less understood. In this study, we explored these interactions using a delayed match-to-sample task, where participants (6 males, 16 females) encountered same target object across six consecutive trials, facilitating transition from WM to LTM. During half repetitions, background color changed. We measured storage contralateral delay activity in electroencephalography. Our results reveal that task-irrelevant changes trigger reactivation memories WM. This may be attributed content–context binding hippocampal pattern separation.

Language: Английский

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Effects of context changes on memory reactivation

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: March 20, 2024

Abstract While the influence of context on long-term memory (LTM) is well-documented, its effects interaction between working (WM) and LTM remain less understood. In this study, we explored these interactions using a delayed match-to-sample task, where participants (6 Male, 16 Female) encountered same target object across six consecutive trials, facilitating transition from WM to LTM. During half repetitions, background color changed. We measured storage contralateral delay activity (CDA) in electroencephalography (EEG). Our results reveal that task-irrelevant changes trigger reactivation memories WM. This may be attributed content-context binding hippocampal pattern separation. Significance Statement Understanding mechanisms updating response changing contexts vital because plays pivotal role shaping memories. study demonstrates, for first time, an irrelevant change triggers learned visual memory. observation underscores importance multi-memory during updating. Challenging traditional models postulate mandatory upon each use, our instead selective process, especially transitions new environments. finding elucidates adaptive nature enhances understanding retrieval processes.

Language: Английский

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Signals of memory building-blocks: Pupil-linked brain arousal predicts event segmentation and episodic memory

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 1, 2024

We automatically segment the continuous stream of our experiences into events with discrete boundaries, and these serve then as building blocks for later episodic memories. How brain creates event representations remains elusive. Here we investigated role noradrenergic (NA) transmission, heavily linked to change-detection, in identifying boundaries during listening auditorily presented narratives. Specifically, how pupil dilation, an indirect physiological proxy NA activity, tracks while short stories everyday events. In a series three studies, could demonstrate that trigger significant magnitude dilations predicts memory Furthermore, also showed dilation at each time point narratives scaled function frequently set independent raters indicated presence boundary preceding specific story location. This results suggests transmission influences encoding by signaling unexpected changes flow experience, which lead identification structuring long-term representations.

Language: Английский

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