CA1 and CA3 differentially support spontaneous retrieval of episodic contexts within human hippocampal subfields
- Psychology, BiologybioRxiv
The authors show that when retrieving items that share an episodic context, subfield CA1 represent similarities between items whereas CA2/3/dentate gyrus represents item-unique features, which explains how the authors can parse their experiences into cohesive episodes while retaining the specific details that support vivid recollection.
A Tale of Two Temporal Coding Strategies: Common and Dissociable Brain Regions Involved in Recency versus Associative Temporal Order Retrieval Strategies
- Psychology, BiologyJournal of Cognitive Neuroscience
A paradigm in which the hippocampus plays a role in both forms of temporal order retrieval, with neocortical networks mediating the different cognitive demands for associative versus recency-based temporal order retrieve is developed.
Complementary learning systems within the hippocampus: A neural network modeling approach to reconciling episodic memory with statistical learning
- Biology, PsychologybioRxiv
This work exposed a neural network model that instantiates known properties of hippocampal projections and subfields to sequences of items with temporal regularities and found that the monosynaptic pathway — the pathway connecting entorhinal cortex directly to region CA1 — was able to support statistical learning and memorization of individual episodes.
Complementary learning systems within the hippocampus: a neural network modelling approach to reconciling episodic memory with statistical learning
- Biology, PsychologyPhilosophical Transactions of the Royal Society B: Biological Sciences
This article exposed a neural network model that instantiates known properties of hippocampal projections and subfields to sequences of items with temporal regularities and found that the monosynaptic pathway—the pathway connecting entorhinal cortex directly to region CA1—was able to support statistical learning, while the trisynaptic pathways learned individual episodes.
Age-related volumetric alterations in hippocampal subiculum region are associated with reduced retention of the “when” memory component
- Psychology, BiologyBrain and Cognition
Transcending time in the brain: How event memories are constructed from experience
- Psychology, BiologyHippocampus
How both temporal stability and change in one's thoughts, goals, and surroundings may provide scaffolding for neural processes to link and separate memories across time is discussed, shedding new light on how the brain transcends time to transform everyday experiences into meaningful memory representations.
Distinct Patterns of Hippocampal and Neocortical Evolution in Primates
- Biology, PsychologyBrain, Behavior and Evolution
Findings indicate that hippocampal function in anthropoids might be substantially augmented by the executive decision-making functions of the neocortex, and humans are found to have a unique cerebral organization combining increased relative CA3, subiculum, and rhinal cortex with increased relative neocortical volumes.
Hippocampal contributions to serial-order memory Running Title : Serial-order memory
- Psychology, Biology
The present review evaluates the literature on hippocampal contributions to human serial order memory from the perspective of three cognitive theories: associative chaining theory, positional coding theory and retrieved-context theory.
Hippocampal contributions to serial‐order memory
- Psychology, BiologyHippocampus
This review evaluates the literature on hippocampal contributions to human serial‐order memory from the perspective of three cognitive theories: associative chaining theory, positional‐coding theory and retrieved‐context theory.
SHOWING 1-10 OF 45 REFERENCES
Complementary Roles of Human Hippocampal Subregions during Retrieval of Spatiotemporal Context
- Biology, PsychologyThe Journal of Neuroscience
High-resolution functional magnetic resonance imaging targeting the MTL along with a multivariate pattern similarity approach showed that successfully retrieving spatiotemporal context defining an episode involved a decrease in pattern similarity between putative spatial and temporal contextual representations in hippocampal subfields CA2/CA3/DG, whereas the parahippocampal cortex showed the opposite pattern.
Adaptation to cognitive context and item information in the medial temporal lobes
- Psychology, BiologyNeuropsychologia
Parahippocampal cortex activation during context reinstatement predicts item recollection.
- Psychology, BiologyJournal of experimental psychology. General
Brain activation with functional magnetic resonance imaging in response to covert reinstatement of a cognitive context, prior to presenting an item memory probe is measured to suggest that PHc activation is correlated with cognitive context retrieval.
Contributions of human hippocampal subfields to spatial and temporal pattern separation
- Biology, PsychologyHippocampus
No evidence for spatial or sequential specialization in the hippocampal subfields is found, consistent with the hypothesis that the dentate gyrus acts as a universal pattern separator.
Multiple routes to memory: Distinct medial temporal lobe processes build item and source memories
- Biology, PsychologyProceedings of the National Academy of Sciences of the United States of America
This work used event-related functional MRI to examine the relation between activation in distinct medial temporal lobe subregions during memory formation and the ability to later recognize an item as previously encountered and later recollect specific contextual details about the prior encounter.
The medial temporal lobe and recognition memory.
- Psychology, BiologyAnnual review of neuroscience
Evidence from neuropsychological, neuroimaging, and neurophysiological studies of humans, monkeys, and rats indicates that different subregions of the MTL make distinct contributions to recollection and familiarity; the data suggest that the hippocampus is critical for recollection but not familiarity.
Distinct roles for dorsal CA3 and CA1 in memory for sequential nonspatial events.
- Biology, PsychologyLearning & memory
A new behavioral task is developed that examines memory for the order of sequential nonspatial events presented as trial-unique odor pairings and suggests that the role of CA3 in sequence memory is not limited to spatial information, but rather appears to be a fundamental property ofCA3 function.
Comparison of population coherence of place cells in hippocampal subfields CA1 and CA3
In a dynamically changing environment, in which familiar landmarks on the behavioural track and along the wall are rotated relative to each other, the population representation of the environment is more coherent between the original and cue-altered environments in CA3 than in CA1.
Two functional components of the hippocampal memory system
- Psychology, BiologyBehavioral and Brain Sciences
It is proposed that neocortical association areas maintain shortterm memories for specific items and events prior to hippocampal processing as well as providing the final repositories of long-term memory.
CA1 subfield contributions to memory integration and inference
- Biology, PsychologyHippocampus
FMRI analyses provide converging evidence that CA1 plays a unique role in encoding overlapping events and highlight the dynamic interactions between hippocampal‐mediated encoding and retrieval processes, which reflect the adaptive nature of episodic memories.