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Updated: May 23, 2026

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice

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Published on: July 1, 2018

Exploring the parahippocampal cortex response to high and low spatial frequency spaces.

Peter Zeidman¹, Sinéad L Mullally, Dietrich Samuel Schwarzkopf

¹Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK.

|April 5, 2012

Summary

The posterior parahippocampal cortex (PHC) responds to simple 3D space, especially with high spatial frequencies, suggesting space coding is a core PHC function.

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Published on: October 24, 2012

Area of Science:

Neuroscience
Cognitive Neuroscience
Neuroimaging

Background:

The posterior parahippocampal cortex (PHC) is implicated in scene processing.
Recent theories propose PHC engagement reflects 3D spatial representation, independent of scenes or objects.
PHC activation may be modulated by low-level visual properties like spatial frequency.

Purpose of the Study:

To investigate if the PHC responds to the mere perception of 3D space using simplified stimuli.
To determine if spatial frequency influences PHC response to spatial information.
To test the hypothesis that PHC's core function involves coding for spatial presence.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to scan participants.
Participants viewed simplified 3D spatial stimuli and matched non-spatial control stimuli.
Stimuli were manipulated for spatial frequency (low-pass filtering) to assess its impact.

Main Results:

A significant interaction between space and spatial frequency was found in the bilateral PHC.
The right PHC showed increased engagement for spatial stimuli with high spatial frequencies compared to non-spatial stimuli.
No preferential response to space was observed in the left PHC.

Conclusions:

A simple depiction of 3D space, devoid of objects or context, can engage the right PHC, particularly with high spatial frequencies.
This finding supports the idea that coding for the presence of space may be a fundamental role of the PHC.
This spatial coding function could underlie the PHC's involvement in various cognitive tasks, including scene processing.