Unilateral peripheral vestibular dysfunction disrupts motion-evoked neuronal responses in primary visual cortex.

Area of Science:

• Neuroscience
• Vestibular System Research
• Visual Cortex Function

Background:

• Acute unilateral peripheral vestibular destruction (AUPVD) causes dizziness with visual and motion disturbances.
• The vestibular nuclei integrate auditory and visual inputs, crucial for balance and gaze.
• The influence of vestibular activity on the primary visual cortex (V1) is not fully understood.

Purpose of the Study:

• To investigate the impact of vestibular nuclei activity on V1 neuronal responses to visual stimuli.
• To elucidate the mechanisms by which vestibular damage affects visual processing in V1.
• To determine the role of vestibular inhibitory neurons in V1 dysfunction following vestibular lesions.

Main Methods:

• Chronic two-photon microscopy in awake AUPVD mice to observe V1 neuronal activity.
• Assessment of V1 neuronal responses to both static and motion visual stimuli.
• Pharmacological and chemogenetic manipulation of GABAergic signaling in the vestibular nuclei of healthy mice.

Main Results:

• V1 neurons in AUPVD mice showed impaired responses to motion stimuli but normal responses to static visual inputs.
• Aberrant activity in vestibular inhibitory neurons, induced pharmacologically or chemogenetically, disrupted V1 neuronal processing in healthy mice.
• Compensatory firing patterns in vestibular inhibitory neurons were identified as a key factor.

Conclusions:

• Vestibular activity significantly influences V1 processing of motion-related visual stimuli.
• Disrupted vestibular inhibitory neuron function following peripheral vestibular damage impairs V1 responses to motion.
• These V1 processing deficits contribute to the dizziness experienced after vestibular damage.