The rapid head rotation test assesses which reflex?

• A. Gag reflex
• B. Oculocephalic reflex
• C. Pupillary reflex
• D. Vestibulo-ocular reflex

Answer: (B)

The rapid head rotation test evaluates the oculocephalic reflex, also known as the doll’s eyes reflex. When the head is turned quickly, the semicircular canals signal the brainstem to move the eyes in the opposite direction so the gaze remains aimed at the target. If the brainstem circuits coordinating these eye movements are intact, the eyes drift smoothly in the opposite direction as the head turns. If brainstem function is compromised, the eyes may go with the head or fail to move together, indicating a problem with brainstem pathways. While the vestibulo-ocular reflex underpins this same eye‑movement response, the rapid head rotation test is classically described as testing the oculocephalic reflex rather than other reflexes like gag or pupillary responses.