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Role of Hippocampus in Memory

Role of Hippocampus in Memory

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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Acute Mouse Brain Slicing to Investigate Spontaneous Hippocampal Network Activity

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Back to the future: preserved hippocampal network activity during reverse ambulation.

Andrew P Maurer¹, Adam W Lester², Sara N Burke¹

¹Evelyn F. McKnight Brain Institute, Arizona Research Laboratories Division of Neural Systems, Memory and Aging, and Department of Neuroscience, College of Medicine, University of Florida, Gainesville, Florida 32611.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|November 8, 2014

Summary

The study found that hippocampal place-field sequences are maintained even when rodents run backward, suggesting posterior parietal cortex involvement in updating spatial representations. This challenges head-direction-based models for sequence updating during movement.

Keywords:

oscillations phase precession place cells population vector sequence learning theta

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Area of Science:

Neuroscience
Cognitive Neuroscience
Spatial Navigation

Background:

The brain's spatial navigation system relies on hippocampal place cells that activate sequentially as an animal moves.
The precise mechanisms for updating these sequential representations during movement, especially when direction of movement and head orientation differ, remain unclear.
Two primary models propose either head-direction cues or posterior parietal cortex (PPC) inputs for sequence updating.

Purpose of the Study:

To investigate the neural mechanisms underlying sequential place-cell activation during movement.
To differentiate between head-direction-based and PPC-based models of hippocampal sequence updating.
To examine how spatial representations are maintained when movement direction opposes head orientation.

Main Methods:

Rodents were trained to run both forward and backward on a linear track.
Electrophysiological recordings captured hippocampal place-cell activity during both running conditions.
Analysis focused on place-field remapping, size changes, population activity reconstruction, and theta phase precession.

Main Results:

Place-field activity remapped and fields increased in size during backward running compared to forward running.
Despite remapping, population activity accurately reconstructed the animal's location.
Theta phase precession, indicative of short-timescale sequence preservation, was maintained in both forward and backward running conditions.
Head direction did not significantly change between running conditions.

Conclusions:

The persistence of place-field sequences during backward running, where movement opposes head orientation, supports the role of the posterior parietal cortex in updating hippocampal activity.
These findings suggest that mechanisms beyond head-direction information are crucial for dynamically updating spatial sequences.
The study provides evidence for a partially PPC-driven mechanism for updating hippocampal spatial representations during locomotion.