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Related Concept Videos

Working Memory01:24

Working Memory

181
Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
181
Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

276
The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
276

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Related Experiment Video

Updated: Jul 13, 2025

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
07:33

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Published on: June 29, 2018

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Theta Oscillations Support Prefrontal-hippocampal Interactions in Sequential Working Memory.

Minghong Su1,2, Kejia Hu3, Wei Liu3

  • 1Institute of Psychology, Chinese Academy of Sciences, Beijing, 100101, China.

Neuroscience Bulletin
|October 17, 2023
PubMed
Summary
This summary is machine-generated.

This study reveals how the dorsolateral prefrontal cortex (DLPFC) and hippocampus use theta oscillations to process sequential information. Enhanced brainwave activity supports memory for ordered lines, improving recall precision.

Keywords:
Dorsolateral prefrontal cortexGranger causalityHippocampusPhase coherenceSequential working memoryStereoelectroencephalography (SEEG)Theta oscillations

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • The prefrontal cortex and hippocampus are implicated in working memory, particularly for sequential information beyond episodic memory and spatial navigation.
  • Understanding the neural mechanisms underlying sequential working memory is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the interaction between the dorsolateral prefrontal cortex (DLPFC) and the hippocampus in the online processing of sequential information.
  • To explore the role of theta oscillations in mediating these interactions during a line ordering task.

Main Methods:

  • Stereoelectroencephalography (SEEG) recordings were obtained from twenty epilepsy patients with electrodes over the DLPFC and hippocampus.
  • Participants performed a line ordering task, contrasting random and ordered line arrangements.
  • Analysis focused on theta power (3-10 Hz) and phase coherences between DLPFC and hippocampus, along with directional influence (DLPFC → hippocampus).

Main Results:

  • Increased thinking time and recall errors in random trials were linked to transient hippocampal and sustained DLPFC theta power increases.
  • Hippocampal theta power increase correlated with memory precision for line orientation.
  • Enhanced theta phase coherence and DLPFC → hippocampus influence were observed during ordering, particularly for precisely memorized lines.

Conclusions:

  • Theta oscillations play a significant role in supporting DLPFC-hippocampal interactions for online sequential information processing.
  • These findings suggest a neural mechanism for how the brain manages and recalls ordered sequences.