Adaptive modification of vestibularly perceived rotation

Area of Science:

• Neuroscience
• Oculomotor Control
• Vestibular System

Background:

• The vestibulo-ocular reflex (VOR) stabilizes gaze during head movements.
• Previous research suggested VOR-driven saccades align with vestibularly perceived oculomotor goals.
• Adaptation to visual-vestibular conflict can modify this vestibular percept.

Purpose of the Study:

• To investigate if saccades accompanying the VOR move towards a vestibularly derived percept of an oculomotor goal.
• To determine if this holds true even when the vestibular percept is adaptively modified.
• To compare VOR + saccade performance with a "motor readout" of the vestibular percept.

Main Methods:

• Utilized a Vestibular Memory-Contingent Saccade (VMCS) paradigm.
• Measured saccadic eye movements after passive whole body rotation in the dark.
• Compared VOR + saccade responses during rotation with VMCS responses post-rotation in normal and adapted states.

Main Results:

• The vestibular perceptual response, measured via VMCS, was indistinguishable from the combined VOR + saccade response during rotation.
• This finding was consistent in both normal and adapted states.
• The results support the hypothesis that VOR-driven saccades target vestibularly perceived goals.

Conclusions:

• Findings substantiate the hypothesis that saccades accompanying the VOR target vestibularly derived oculomotor goals.
• The study reaffirms the adaptive modifiability of vestibular perception.
• Emphasizes the necessity of actively maintaining vestibular perception calibration based on behavioral context.