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Transient Inhibition of the Posterior Parietal Cortex Affects Action-related But Not Action-unrelated Visual

Florian Bublatzky¹, Martin Riemer^2,3

¹Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University.

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|June 24, 2025

Summary

The posterior parietal cortex (PPC) is crucial for path integration during active movement, but not passive optic flow perception. This highlights the PPC's role in processing self-motion cues for navigation.

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Area of Science:

Neuroscience
Cognitive Science
Human Navigation

Background:

Path integration, essential for navigation, is traditionally linked to medial temporal lobe structures.
Emerging evidence suggests posterior parietal cortex (PPC) involvement in navigational computations.
The role of PPC in relation to active versus passive self-motion perception remains unclear.

Purpose of the Study:

To investigate whether human path integration relies on PPC processing streams.
To differentiate the PPC's role in actively controlled motion versus passive optic flow perception.

Main Methods:

Used transcranial magnetic stimulation (TMS) to inhibit the PPC.
Compared performance on two virtual reality path integration tasks: one with active movement, one with passive optic flow.
Analyzed behavioral performance, specifically distance judgments.

Main Results:

Inhibiting the PPC selectively impaired distance judgments in the active movement path integration task.
Performance on the passive optic flow task was unaffected by PPC inhibition.
This indicates PPC is critical for actively controlled motion, but not passive optic flow.

Conclusions:

The posterior parietal cortex (PPC) is essential for processing actively controlled self-motion during path integration.
Passive perception of optic flow for navigation is largely independent of the PPC.
The PPC integrates self-positional signals within an egocentric frame, complementing medial temporal lobe functions.