scholarly journals Increases in Theta Oscillatory Activity During Episodic Memory Retrieval Following Mindfulness Meditation Training

2019 ◽  
Vol 13 ◽  
Author(s):  
Erika Nyhus ◽  
William Andrew Engel ◽  
Tomas Donatelli Pitfield ◽  
Isabella Marie Wang Vakkur
Keyword(s):  
Episodic Memory ◽  
Memory Retrieval ◽  
Mindfulness Meditation ◽  
Oscillatory Activity

scholarly journals Electrophysiological studies of identifying and modulating the preparatory strategic processes involved in episodic memory retrieval

2018 ◽  
Author(s):  
◽  
Mason H. Price
Keyword(s):  
Episodic Memory ◽  
Memory Retrieval ◽  
Task Demands ◽  
Event Related Potential ◽  
Oscillatory Activity ◽  
Retrieval Task ◽  
Retrieval Cues ◽  
Starting Point ◽  
Episodic Memories ◽  
Cue Processing

Successful retrieval of episodic memories has been shown to depend on the overlap between the processes engaged during encoding and those re-engaged during retrieval. The ability to strategically adapt cue processing to maximize this overlap, sometimes referred to as “retrieval orientation”, has been supported by numerous studies employing electroencephalography (EEG), which demonstrate differences according to the class of memories being sought. However, research in this domain has largely focused on event-related potential (ERP) effects of sustained amplitude that occur after the onset of retrieval cues, thereby failing to indicate whether such effects might be engaged in a preparatory manner before cue onset. Here, we describe two experiments that addressed this issue by employing an analysis approach focusing on the pre-stimulus period of retrieval test trials and capitalizing on the increased sensitivity of multivariate pattern analysis (MVPA) of oscillatory activity. Experiment 1 established evidence of a preparatory form of retrieval orienting and examined the potential fluctuation versus stability of such processing. Experiment 2 attempted to directly modulate the engagement of orienting processes by parametrically manipulating the extent to which responses during the retrieval task are speeded. By novelly quantifying the relationship between multivariate neural correlates of retrieval orientation and behavioral measures of performance, and testing how orienting might be flexibly adjusted to meet task demands, the current project serves as a starting point for developing techniques aimed at improving episodic memory retrieval through strategic control.

scholarly journals From hippocampus to whole-brain: The role of integrative processing in episodic memory retrieval

2017 ◽  
Vol 38 (4) ◽  
pp. 2242-2259 ◽  
Author(s):  
Benjamin R. Geib ◽  
Matthew L. Stanley ◽  
Nancy A. Dennis ◽  
Marty G. Woldorff ◽  
Roberto Cabeza
Keyword(s):  
Episodic Memory ◽  
Memory Retrieval ◽  
Whole Brain ◽  
Integrative Processing

Parietal cortex and episodic memory retrieval in schizophrenia

2010 ◽  
Vol 182 (3) ◽  
pp. 191-199 ◽  
Author(s):  
Martin Lepage ◽  
Marc Pelletier ◽  
Amélie Achim ◽  
Alonso Montoya ◽  
Matthew Menear ◽  
...  
Keyword(s):  
Episodic Memory ◽  
Parietal Cortex ◽  
Memory Retrieval

Going Their Separate Ways: Dissociation of Hippocampal and Dorsolateral Prefrontal Activation during Episodic Retrieval and Post-retrieval Processing

2010 ◽  
Vol 22 (3) ◽  
pp. 513-525 ◽  
Author(s):  
Sarah L. Israel ◽  
Tyler M. Seibert ◽  
Michelle L. Black ◽  
James B. Brewer
Keyword(s):  
Episodic Memory ◽  
Memory Retrieval ◽  
Relative Increase ◽  
Network Activity ◽  
Default Network ◽  
Episodic Retrieval ◽  
Retrieval Task ◽  
Paired Associates ◽  
Hippocampal Activity ◽  
Dorsolateral Prefrontal

Hippocampal activity is modulated during episodic memory retrieval. Most consistently, a relative increase in activity during confident retrieval is observed. Dorsolateral prefrontal cortex (DLPFC) is also activated during retrieval, but may be more generally activated during cognitive-control processes. The “default network,” regions activated during rest or internally focused tasks, includes the hippocampus, but not DLPFC. Therefore, DLPFC and the hippocampus should diverge during difficult tasks suppressing the default network. It is unclear, however, whether a difficult episodic memory retrieval task would suppress the default network due to difficulty or activate it due to internally directed attention. We hypothesized that a task requiring episodic retrieval followed by rumination on the retrieved item would increase DLPFC activity, but paradoxically reduce hippocampal activity due to concomitant suppression of the default network. In the present study, blocked and event-related fMRI were used to examine hippocampal activity during episodic memory recollection and postretrieval processing of paired associates. Subjects were asked to make living/nonliving judgments about items visually presented (classify) or items retrieved from memory (recall–classify). Active and passive baselines were used to differentiate task-related activity from default-network activity. During the “recall–classify” task, anterior hippocampal activity was selectively reduced relative to “classify” and baseline tasks, and this activity was inversely correlated with DLPFC. Reaction time was positively correlated with DLPFC activation and default-network/hippocampal suppression. The findings demonstrate that frontal and hippocampal activity are dissociated during difficult episodic retrieval tasks and reveal important considerations for interpreting hippocampal activity associated with successful episodic retrieval.

scholarly journals Electrophysiological signatures of memory reactivation in humans

2020 ◽  
Vol 375 (1799) ◽  
pp. 20190293 ◽  
Author(s):  
Thomas Schreiner ◽  
Tobias Staudigl
Keyword(s):  
Episodic Memory ◽  
Neural Activity ◽  
Crucial Role ◽  
Memory Retrieval ◽  
Functional Significance ◽  
State Of The Art ◽  
Memory Reactivation ◽  
Open Questions ◽  
Neural Processes

The reactivation of neural activity that was present during the encoding of an event is assumed to be essential for human episodic memory retrieval and the consolidation of memories during sleep. Pioneering animal work has already established a crucial role of memory reactivation to prepare and guide behaviour. Research in humans is now delineating the neural processes involved in memory reactivation during both wakefulness and sleep as well as their functional significance. Focusing on the electrophysiological signatures of memory reactivation in humans during both memory retrieval and sleep-related consolidation, this review provides an overview of the state of the art in the field. We outline recent advances, methodological developments and open questions and specifically highlight commonalities and differences in the neuronal signatures of memory reactivation during the states of wakefulness and sleep. This article is part of the Theo Murphy meeting issue ‘Memory reactivation: replaying events past, present and future’.

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