Cervico-ocular reflex in the normal adult

Area of Science:

• Neuroscience
• Ophthalmology
• Vestibular System

Background:

• The cervico-ocular reflex (COR) is a vestibulo-ocular reflex.
• Its role in visual stability during body movement is not fully understood.

Purpose of the Study:

• To measure the cervico-ocular reflex (COR) in humans during active and passive body rotations.
• To determine if the COR contributes to retinal image stabilization.

Main Methods:

• Ten subjects stood on a rotating platform in a dark room.
• Head position was fixed with a biteplate.
• Eye movements were recorded during vertical axis rotations.

Main Results:

• COR gain was up to 22% at low frequencies (0.025 Hz), decreasing to 2% at higher frequencies (0.4 Hz).
• Phase angles averaged around -180 degrees.
• Active and passive rotation responses were similar.

Conclusions:

• The COR in humans does not significantly aid in retinal image stabilization.
• The reflex's function in visual stability during body rotation is limited in normal adults.