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Related Concept Videos

Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

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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...
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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Related Experiment Video

Updated: Sep 6, 2025

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Hippocampal signals modify orbitofrontal representations to learn new paths.

Justin S Riceberg1, Aditya Srinivasan2, Kevin G Guise3

  • 1Department of Neuroscience and Experimental Therapeutics, Albany Medical College, 47 New Scotland Avenue, MC-136, Albany, NY 12208, USA; Department of Psychiatry, Icahn School of Medicine at Mount Sinai, Hess Center for Science and Medicine, 1470 Madison Avenue, New York, NY 10029, USA.

Current Biology : CB
|June 28, 2022
PubMed
Summary
This summary is machine-generated.

The hippocampus and orbitofrontal cortex coordinate during learning to predict outcomes. Novel situations trigger specific interactions, with the hippocampus guiding orbitofrontal cortex remapping for adaptive decision-making.

Keywords:
decision-makingexpected outcomefrontotemporalhippocampuslearningmemoryorbitofrontalsynchronytheta

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Decision-Making

Background:

  • Recalling past choices relies on the hippocampus (HPC) and orbitofrontal cortex (OFC) for adapting to new circumstances.
  • Both HPC and OFC are implicated in spatial reversal tasks, with their respective cells firing in theta oscillations.
  • The precise mechanisms of OFC-HPC interaction in predicting outcomes during changing conditions are not well understood.

Purpose of the Study:

  • To investigate the neural mechanisms underlying OFC-HPC interactions during learning in spatial reversal tasks.
  • To determine how these brain regions coordinate to predict outcomes when environmental contingencies change.

Main Methods:

  • Simultaneous ensemble recordings from the OFC and CA1 region of the hippocampus in rats.
  • Rats performed a spatial reversal task in a plus maze.
  • Analysis of neural activity, including population vectors, spike timing, and theta oscillations.

Main Results:

  • Striking interactions between CA1 and OFC were observed specifically during the learning of the first reversal.
  • CA1 population activity predicted OFC activity changes, and OFC spikes phase-locked to hippocampal theta oscillations.
  • CA1 led OFC spikes by approximately 30 ms, suggesting a directional influence during initial learning.

Conclusions:

  • OFC-HPC interactions are dynamically engaged during the learning of new task contingencies.
  • Hippocampal signals may trigger cognitive remapping in the OFC, facilitating the linking of novel experiences with expected outcomes.
  • These findings elucidate a mechanism for adaptive decision-making under changing circumstances.