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Hierarchical nesting of slow oscillations, spindles and ripples in the human hippocampus during sleep
TLDR
This work used direct intracranial electroencephalogram recordings from human epilepsy patients during natural sleep to test the assumption that SOs, spindles and ripples are functionally coupled in the hippocampus, and found thatSpindles were modulated by the up-state of SOs.
Perirhinal and Parahippocampal Cortices Differentially Contribute to Later Recollection of Object- and Scene-Related Event Details
TLDR
The results strongly point to representational domain as a key factor determining the involvement of different MTLC subregions during successful episodic memory formation.
Selective and Shared Contributions of the Hippocampus and Perirhinal Cortex to Episodic Item and Associative Encoding
TLDR
A subsequent memory paradigm that assessed successful item encoding in addition to the encoding of two distinct episodic details, providing strong evidence for a role of the hippocampus in domain-general associative encoding and raising the possibility that PrC encoding operations in conjunction with hippocampal mechanisms contribute to later recollection of presented item details.
Differential Encoding Mechanisms for Subsequent Associative Recognition and Free Recall
TLDR
Functional magnetic resonance imaging was used to investigate the encoding mechanisms that support later free recall and their relationship to those that support different forms of later recognition memory and found that activation in the left inferior frontal gyrus and hippocampus correlated with later associative/relational recognition.
Episodic Reinstatement in the Medial Temporal Lobe
TLDR
It is shown that neural activity patterns for unique word-scene combinations encountered during encoding are reinstated in human parahippocampal cortex (PhC) during retrieval, consistent with a role of the hippocampus in coordinating pattern completion in cortical regions.
Awake reactivation predicts memory in humans
TLDR
It is found that a particular part of the medial temporal lobe, a brain region known to be critical for intact memory, spontaneously reactivates these events even when the authors are engaged in unrelated activities, suggesting that offline reactivation might be a key mechanism for bolstering episodic memory beyond initial study processes.
Medial Temporal Theta/Alpha Power Enhancement Precedes Successful Memory Encoding: Evidence Based on Intracranial EEG
TLDR
It is proposed that the observed medial temporal theta and alpha power increases before stimulus presentation reflect activation of contextual information and inhibitory top-down control processes preparing for stimulus-triggered memory processing.
Event congruency enhances episodic memory encoding through semantic elaboration and relational binding.
TLDR
A set of behavioral and neuroimaging experiments are reported demonstrating that congruous events engage regions along the left inferior frontal gyrus (LIFG)--consistently related to semantic elaboration--to a significantly greater degree than incongruous events, providing evidence in favor of this hypothesis.
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