scholarly journals Complementary Role of Frontoparietal Activity and Cortical Pattern Similarity in Successful Episodic Memory Encoding

2012 ◽  
Vol 23 (7) ◽  
pp. 1562-1571 ◽  
Author(s):  
Gui Xue ◽  
Qi Dong ◽  
Chuansheng Chen ◽  
Zhong-Lin Lu ◽  
Jeanette A. Mumford ◽  
...  
Keyword(s):  
Episodic Memory ◽  
Memory Encoding ◽  
Complementary Role ◽  
Pattern Similarity

scholarly journals The neuropsychology of emerging psychosis and the role of working memory in episodic memory encoding

2018 ◽  
Vol Volume 11 ◽  
pp. 157-168 ◽  
Author(s):  
Marlon O Pflueger ◽  
Pasquale Calabrese ◽  
Erich Studerus ◽  
Ronan Zimmermann ◽  
Ute Gschwandtner ◽  
...  
Keyword(s):  
Working Memory ◽  
Episodic Memory ◽  
Memory Encoding

Frontal lobe contributions to recognition and recall: Linking basic research with clinical evaluation and remediation

2006 ◽  
Vol 12 (2) ◽  
pp. 210-223 ◽  
Author(s):  
PATRICK S. R. DAVIDSON ◽  
ANGELA K. TROYER ◽  
MORRIS MOSCOVITCH
Keyword(s):  
Decision Making ◽  
Episodic Memory ◽  
Clinical Evaluation ◽  
Basic Research ◽  
Frontal Lobes ◽  
Focal Lesion ◽  
Memory Encoding ◽  
Memory Impairments ◽  
Memory Problems

The role of the human frontal lobes in episodic memory is becoming better understood, thanks mainly to focal lesion and neuroimaging studies. Here we review some recent findings from basic research on the frontal lobes in memory encoding, search, and decision-making at retrieval. For each of these processes, researchers have uncovered cases in which frontal memory impairments can be attenuated by various task manipulations. We suggest ways in which these findings may inform clinical evaluation and rehabilitation of memory problems following frontal damage. (JINS, 2006,12, 210–223.)

scholarly journals Aberrant prefrontal beta oscillations predict episodic memory encoding deficits in schizophrenia

2016 ◽  
Author(s):  
Federica Meconi ◽  
Sarah Anderl-Straub ◽  
Heidelore Raum ◽  
Michael Landgrebe ◽  
Berthold Langguth ◽  
...  
Keyword(s):  
Episodic Memory ◽  
Verbal Memory ◽  
Semantic Processing ◽  
Memory Performance ◽  
Oscillatory Activity ◽  
Healthy Controls ◽  
Memory Encoding ◽  
Brain Oscillations ◽  
Beta Power ◽  
Pattern Similarity

AbstractVerbal episodic memory is one of the core cognitive functions affected in patients suffering from schizophrenia (SZ). Although this verbal memory impairment in SZ is a well-known finding, our understanding about its underlying neurophysiological mechanisms is rather scarce. Here we address this issue by recording brain oscillations during a memory task in a sample of healthy controls and patients suffering from SZ. Brain oscillations represent spectral fingerprints of specific neurocognitive operations and are therefore a promising tool to identify neurocognitive mechanisms that are affected by SZ. Healthy controls showed a prominent suppression of left prefrontal beta oscillatory activity during successful memory formation, which replicates several previous oscillatory memory studies. In contrast, patients failed to exhibit such left prefrontal beta power suppression. Utilizing a new topographical pattern similarity approach, we further demonstrate that the degree of similarity between a patient's beta power decrease to that of the controls reliably predicted memory performance. This relationship between beta power decreases and memory was such that the patients' memory performance improved as they showed a more similar topographical beta desynchronization pattern compared to that of healthy controls. These findings suggest that left prefrontal beta power suppression (or lack thereof) during memory encoding is a possible biomarker for the observed encoding impairments in SZ in verbal memory. This lack of left prefrontal beta power decreases might indicate a specific semantic processing deficit of verbal material in patients with schizophrenia.

scholarly journals Hippocampal-medial prefrontal event segmentation and integration contribute to episodic memory formation

2020 ◽  
Author(s):  
Wei Liu ◽  
Yingjie Shi ◽  
James N Cousins ◽  
Nils Kohn ◽  
Guillen Fernandez
Keyword(s):  
Episodic Memory ◽  
Memory Formation ◽  
Connectivity Pattern ◽  
Activation Pattern ◽  
Sequential Order ◽  
Event Segmentation ◽  
Activation Patterns ◽  
Pattern Similarity ◽  
Connectivity Patterns

How do we encode our continuous life experiences for later retrieval? Theories of event segmentation and integration suggest that the hippocampus binds separately represented events into an ordered narrative. Using an open-access functional Magnetic Resonance Imaging (fMRI) movie watching-recall dataset, we quantified two types of neural similarities (i.e., activation pattern similarity and within-region voxel-based connectivity pattern similarity) between separate events during movie watching and related them to subsequent retrieval of events as well as retrieval of sequential order. We demonstrate that distinct activation patterns of the hippocampus and medial prefrontal cortex form event memories. By contrast, similar within-region connectivity patterns between events facilitate memory formation and are relevant for the retention of events in the correct sequential order. We applied the same approaches to an independent movie watching fMRI dataset and replicational analyses highlighted again the role of hippocampal activation pattern and connectivity pattern in memory formation. We propose that distinct activation patterns represent neural segmentation of events while similar connectivity patterns encode context information, and therefore integrate events into a narrative. Our results provide novel evidence for the role of hippocampal-medial prefrontal event segmentation and integration in episodic memory formation of real-life experience.

The Role of Attention in Episodic Memory Impairment During Nicotine Withdrawal

2007 ◽  
Author(s):  
Paul S. Merritt ◽  
Adam Cobb ◽  
Luke Moissinac ◽  
Corpus Christi ◽  
Elliot Hirshman
Keyword(s):  
Episodic Memory ◽  
Memory Impairment ◽  
Nicotine Withdrawal

Children show adult-like hippocampal pattern separation for familiar but not novel events

2020 ◽  
Author(s):  
Susan L. Benear ◽  
Elizabeth A. Horwath ◽  
Emily Cowan ◽  
M. Catalina Camacho ◽  
Chi Ngo ◽  
...  
Keyword(s):  
Episodic Memory ◽  
Temporal Lobe ◽  
Medial Temporal Lobe ◽  
Developmental Change ◽  
Pattern Separation ◽  
Developmental Changes ◽  
Similarity Analysis ◽  
Separation Processes ◽  
Parahippocampal Cortex ◽  
Pattern Similarity

The medial temporal lobe (MTL) undergoes critical developmental change throughout childhood, which aligns with developmental changes in episodic memory. We used representational similarity analysis to compare neural pattern similarity for children and adults in hippocampus and parahippocampal cortex during naturalistic viewing of clips from the same movie or different movies. Some movies were more familiar to participants than others. Neural pattern similarity was generally lower for clips from the same movie, indicating that related content taxes pattern separation-like processes. However, children showed this effect only for movies with which they were familiar, whereas adults showed the effect consistently. These data suggest that children need more exposures to stimuli in order to show mature pattern separation processes.

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