What is primarily responsible for controlling pursuits?

• A. Ipsilateral Frontal Eye Fields
• B. Contralateral Frontal Eye Fields
• C. Ipsilateral Parietal Lobe
• D. Contralateral Parietal Lobe

Answer: (C)

Smooth pursuit relies on motion-processing areas in the posterior parietal cortex, specifically the parietal eye fields in the hemisphere on the same side as the direction you’re tracking. These regions receive motion signals (from areas like MT/MST) and translate them into a continuous motor command that keeps the eyes smoothly following a moving target. The frontal eye fields, while important for initiating and controlling certain eye movements, are more closely tied to saccades than to the ongoing, velocity-mized tracking of pursuit. Clinically, when the parietal lobe on one side is impaired, pursuit toward that same side is typically affected, underscoring that pursuit control is primarily driven by the ipsilateral parietal cortex.