Exploring the role of dimensionality transformation in episodic memory

Trends in Cognitive Sciences, Год журнала: 2025, Номер unknown

Опубликована: Фев. 1, 2025

Episodic memory must accomplish two adversarial goals: encoding and storing a multitude of experiences without exceeding the finite neuronal structure brain, recalling memories in vivid detail. Dimensionality reduction expansion ('dimensionality transformation') enable brain to meet these demands. Reduction compresses sensory input into simplified, storable codes, while reconstructs details. Although processes are essential memory, their neural mechanisms for episodic remain unclear. Drawing on recent insights from cognitive psychology, systems neuroscience, neuroanatomy, we propose accounts how dimensionality transformation occurs brain: structurally (via corticohippocampal pathways) functionally (through oscillations). By examining cross-species evidence, highlight that may support identify crucial questions future research.

Язык: Английский

---

Within-Individual Precision Mapping of Brain Networks Exclusively Using Task Data

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2025, Номер unknown

Опубликована: Фев. 25, 2025

Precision mapping of brain networks within individuals has become a widely used tool that prevailingly relies on functional connectivity analysis resting-state data. Here we explored whether could be precisely estimated solely using data acquired during active task paradigms. The straightforward strategy involved extracting residualized after application task-based general linear model (GLM) and then applying standard analysis. Functional correlation matrices from were highly similar to those derived traditional fixation largest factor affecting similarity between was the amount Networks within-individual displayed strong spatial overlap with predicted same triple dissociation in independent implications these findings are (1) existing can reanalyzed estimate network organization, (2) restingstate pooled increase statistical power, (3) future studies exclusively acquire both extract responses. Most broadly, present results suggest there is an underlying, stable architecture idiosyncratic individual persists across states.

Язык: Английский

---

Embedding Emotion Concepts in Cognitive Maps

Neuroscience & Biobehavioral Reviews, Год журнала: 2025, Номер unknown, С. 106089 - 106089

Опубликована: Март 1, 2025

Emotion knowledge is organized in a two-dimensional space known as the affective circumplex, which thought to develop from core feelings and co-occurrence of emotional events. Neural studies reveal that emotion concepts cognitive maps abstract are represented hippocampal-prefrontal systems. We propose circumplex formed by learning transitions between concepts, process mediated reciprocal network involving hippocampal cells encode grid medial entorhinal ventral prefrontal cortices relations them. anticipate testing this hypothesis will shed light on debate about whether emotions biologically basic or constructed dimensions.

Язык: Английский

---

Newly trained navigation and verbal memory skills elicit changes in task-related networks but not brain structure

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2025, Номер unknown

Опубликована: Апрель 19, 2025

Abstract Training cognitive skills, such as remembering a list of words or navigating new city, has important implications for both health and disease. Yet, understanding what brain changes underlie the acquisition complex skills remains unresolved. Here, we developed validated intensive multiweek interventions in which participants were randomly assigned training either navigation verbal memory. Healthy young (N=75) underwent structural functional imaging prior to following training. Based on pre-registered exploratory analyses, did not find any evidence hippocampal volume, subfields, cortical white matter connectivity due In contrast, network-based analyses suggested task-related informational connectivity, occurred primarily between areas mostly involved putative control networks. These results suggest that target more transient configurations network rather than durable changes.

Язык: Английский

---

From single scenes to extended scenarios: the role of the ventromedial prefrontal cortex in the construction of imagery-rich events

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2025, Номер unknown

Опубликована: Май 5, 2025

Abstract Mental events are fundamental to daily cognition, including the recollection of past experiences, anticipation future scenarios, and engagement in imaginative, fictitious thought. Typically, these temporally extended mental unfold within coherent spatial contexts, rich naturalistic scenes objects. However, there remains a significant gap understanding how represented brain. This study aimed investigate neural patterns involved construction events. Using ultra-high field functional magnetic resonance imaging, we examined brain regions previously implicated this cognitive process, ventromedial prefrontal cortex (vmPFC), hippocampus, posterior neocortex. We employed novel experimental paradigm which participants engaged three forms imagery: single objects (e.g., “a black espresso”), busy café”), scenarios “meeting friend for coffee”). identified shared network - comprising vmPFC, neocortex – across all imagery. observed hierarchical organization their contributions: supported objects, scenes, while hippocampus primarily contributed scenarios. The vmPFC exhibited stepwise increase activation, peaking during scenario construction. These findings suggest that emerges from close interaction perceptual details provided by neocortex, coherence integration those elements into coherent, event “movies” mind.

Язык: Английский

---

Topography of cognition: Evolution of parallel distributed association networks in primates

Elsevier eBooks, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Язык: Английский

---