Educational Vision Pursuit Simulator
Brain network (schematic)
Select condition:
Normal smooth pursuit
Both pupils follow the target smoothly with minimal lag. No drift, no overshoot, no sudden jumps.
Parkinson (basal ganglia)
Pursuit starts late and is slow. The eyes stay behind the target and occasionally make clear catch-up saccades.
Cerebellar disorder
Pupils can follow the target but drift back toward center and then correct again, creating a wavy, unstable tracking pattern.
Frontal / FEF dysfunction
Around reversals, the eyes briefly move in the wrong direction or hesitate, then recover and follow the target again.
MT / MST motion pathway
Motion is underestimated. The eyes always lag behind the target with a clear constant offset, never fully catching up.
Vestibular / brainstem
The eyes track the target, but a slow baseline drift pulls gaze to one side, shifting the whole pursuit path.
ADHD
Pursuit is mostly normal, but brief lapses of attention create small jumps (micro-saccades) away from the target and back.
Autism spectrum
Tracking is rigid. After each reversal the eyes freeze briefly before shifting, leading to visible delay in changing direction.
Learning disorder / dyslexia
Eyes follow the target but overshoot and then undershoot, producing small oscillations around the target path.
