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The Vestibular System

The Vestibular System

The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.

Equilibrium and Balance

Equilibrium and Balance

The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...

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Related Experiment Video

Updated: Jul 5, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

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Posterior parietal rTMS disrupts human Path Integration during a vestibular navigation task.

Barry M Seemungal¹, Vincenzo Rizzo, Michael A Gresty

¹Division of Neurosciences and Mental Health, Imperial College, Charing Cross Hospital Campus, London W6 8RF, United Kingdom. b.seemungal@imperial.ac.uk

Neuroscience Letters

|April 29, 2008

Summary

The posterior parietal cortex is crucial for processing vestibular signals related to angular displacement, a process known as Path Integration. However, it does not appear to be involved in the perception of self-motion velocity.

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Area of Science:

Neuroscience
Vestibular System Research
Human Brain Function

Background:

The neural basis of vestibular perception, particularly self-motion velocity and displacement, remains largely unknown.
Distinguishing cortical areas for vestibular velocity versus displacement (Path Integration) perception is challenging.
Prior studies lacked head motion stimuli, hindering the localization of specialized vestibular cortical areas.

Purpose of the Study:

To investigate the distinct cortical substrates for vestibular perception of angular displacement (Path Integration) versus velocity.
To determine if specific brain regions are specialized for processing different types of vestibular information.
To identify the role of the posterior parietal cortex in vestibular-based navigation.

Main Methods:

Utilized repetitive transcranial magnetic stimulation (rTMS) to disrupt posterior parietal cortex activity.
Assessed the impact of rTMS on performance in a displacement-dependent vestibular navigation task.
Measured the effect of rTMS on the perception of angular displacement and self-motion velocity.

Main Results:

Repetitive transcranial magnetic stimulation of the posterior parietal cortex significantly disrupted performance on the vestibular displacement task.
This disruption was observed for both left and right hemispheres, suggesting bilateral involvement in Path Integration.
No association was found between rTMS of the right posterior parietal cortex and vestibular-sensed velocity perception.

Conclusions:

The posterior parietal cortex plays a critical role in human Path Integration, processing vestibular-derived angular displacement signals.
Vestibular signal processing for perceived angular displacement is distinct from that for perceived self-motion velocity.
Evidence suggests separate cortical areas are responsible for vestibular velocity perception and Path Integration.