Perception Lab
Five interactive demos at the intersection of neuroscience and design — visual illusions, contrast sensitivity, and temporal perception.
Five interactive perceptual demos — each reveals something non-obvious about how the brain constructs visual experience.
① Color Afterimage
Stare at the center dot for 30 seconds without blinking, then click Switch. You'll see a cyan ghost where the red circle was — the opponent channel (red/green) fatigues and inverts.
② Contrast Sensitivity Function
Adjust spatial frequency and contrast. Human sensitivity peaks ~4 cycles/degree and falls at both extremes — the CSF. Fine gratings (high SF) require higher contrast to be visible.
③ Motion-Induced Blindness
Fix your gaze on the center cross. The three yellow dots periodically disappear — not because they move, but because the rotating background suppresses them. Awareness ≠ retinal signal.
④ Neural Network — Live Weights
A 2-input → 3-hidden → 1-output network. Click Train step to run one backprop pass on the XOR problem. Watch weights update in real time — edge thickness = weight magnitude, color = sign.
⑤ Temporal Binding Window
You'll see a flash and hear (or imagine) a beep with a variable delay. Click Simultaneous or Sequential. After 10 trials your personal TBW is estimated — the window within which your brain fuses audiovisual events.
