Peripheral Drift 🟡 Medium
Moving Circles
Concentric gears that seem to rotate slowly in your peripheral vision as you look around.
Use the controllers inside the display card to interact with the visual triggers.
Use the controllers inside the display card to interact with the visual triggers.
🎮 EXPERIENCE IT FIRST
Before reading the neuroscience explanation below, take a moment to interact with the demo above:
- How does the visual change when you move your eyes or look at different parts of the screen?
- Use the slider or toggle buttons to reveal the actual geometric layout. Did it match what your eyes predicted?
- Pay attention to whether you can consciously force your brain to switch between interpretations.
🧠 THE SCIENCE
The Moving Circles illusion (related to the Pinna-Brelstaff effect) is a peripheral drift anomaly. Concentric rings of small, shaded wedges are oriented in a circular path. When you scan your eyes across the image or move your head, the circles appear to rotate. This occurs because the individual wedges have asymmetric shading gradients (ranging from black, gray, to white). The retinal cells and the V1 visual cortex process high-contrast borders faster than low-contrast borders. When you shift your gaze, these slight differences in processing speed (latency) are integrated by motion area MT/V5 as directional movement, creating the illusion of rotation. Perfect fixation on the center point stops the motion.
💡 FUN FACTS
- • Concentric circles with asymmetric gradients trigger rotational vectors in area MT/V5.
- • The illusion is highly active in peripheral vision because peripheral receptive fields are larger and more sensitive to transient movement.
- • If you freeze your eyes on a single point, the circles stop moving immediately.
- • The direction of rotation is determined by the order of the shading gradient (dark-to-light).
🧪 TRY THIS AT HOME
Look at the concentric rings, then look rapidly back and forth between two opposite corners of the screen. You will see the circles spin in opposite directions with each eye movement, showing how saccades trigger the illusion!
📜 WHO DISCOVERED IT
Discoverer: Akiyoshi Kitaoka (2004)
Kitaoka developed the Moving Circles illusion during his research into peripheral drift. By arranging shaded blocks in concentric rings, he showed that saccadic eye movements trigger rapid orientation shifts in visual area MT/V5, causing the circles to spin.
Educational Resources & History
Moving Circles peripheral drift optical illusion explanation. Learn how asymmetric shading gradients and saccadic eye movements trigger rotation vectors in MT/V5, making static rings appear to spin.