CORE stands for which combination of physiologic nystagmus types?

• A. Caloric nystagmus
• B. Optokinetic nystagmus
• C. Rotational nystagmus
• D. Caloric nystagmus, Optokinetic nystagmus, Rotational nystagmus, End-point nystagmus

Answer: (D)

CORE is the group of four physiologic nystagmus types driven by different stimuli: caloric nystagmus from warm or cold irrigation of the ear, optokinetic nystagmus from movement of a visual scene, rotational nystagmus from actual head rotation, and end-point nystagmus that appears when the eyes reach the extreme end of a gaze. These four together represent the full set of normal, physiologic nystagmus responses typically tested. The other options list only some of these types, omitting one or more components, so they don’t capture the complete CORE combination. Therefore, the full four-type set is the correct choice.