Home▸Neuroscience & Biophysics▸Primitive Reflexes: The Automatic Movements Every Newborn Is Born With

👶 Primitive Reflexes: The Automatic Movements Every Newborn Is Born With

Explore the automatic, involuntary movements every newborn is born with, from the Moro startle to the Babinski toe fan, and learn why their scheduled disappearance is a key marker of healthy brain development.

Neuroscience & Biophysics3DModerate60 FPS

This simulator lets you trigger each primitive reflex on a virtual newborn and watch how the response changes as the infant ages, showing exactly when normal reflexes should fade.

🔬 What It Demonstrates

This simulator lets you trigger each primitive reflex on a virtual newborn and watch how the response changes as the infant ages, showing exactly when normal reflexes should fade.

🎮 How to Use

Select a reflex, apply its trigger stimulus, and slide the age control forward to see how the response strength changes from birth through around 6 months.

💡 Did You Know?

The Babinski reflex is unique among primitive reflexes because doctors also test for it throughout adulthood, since its reappearance later in life can signal a neurological problem rather than being expected and normal.

⚙ Under the hood

primitive reflexesnewborn developmentmoro reflexrooting reflexbabinski reflexinfant neurologypediatricsbrain development

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install