Biology

Your brain predicts, it does not photograph

The checkershadow illusion tricks you because your visual system assumes a shadow is dimming one square, so it mentally brightens that square to compensate, even though both squares are printed in the exact same gray. MIT vision scientist Edward Adelson designed the illusion in 1995 to reveal this automatic color correction.

Sources & further reading

Behavioral and Brain Sciences, Cambridge University PressWhatever next? Predictive brains, situated agents, and the future of cognitive scienceA widely cited cognitive-science paper arguing the brain works mainly by predicting what it will sense next, correcting only when surprised. This is presented as the leading model, not a closed, fully settled fact.Trends in Cognitive Sciences (Cell Press)Interoceptive inference, emotion, and the embodied selfA paper extending the same predicting-not-recording idea beyond eyesight, to how you feel your own body.MIT Perceptual Science GroupCheckershadow IllusionMIT's classic optical illusion showing your brain reports its inferred guess about an object's color, not the raw light entering your eye.Exploratorium (San Francisco)Blind SpotA hands-on museum activity demonstrating that your brain invisibly patches a genuine hole in your vision.arXiv (presented at ICLR 2017)Deep Predictive Coding Networks for Video Prediction and Unsupervised LearningA machine-learning paper showing the brain's predict-then-correct idea can be built into an artificial network that learns by predicting video frames.Proceedings of the Royal Society B: Biological SciencesSynaesthesia in phantom limbs induced with mirrorsThe original paper describing mirror box therapy for phantom limb pain.Meta Horizon OS Developers (Oculus)VR Sickness, The Rift, and How Game Developers Can HelpMeta's own developer guidance describing VR motion sickness as a clash between two predictions, and how designers reduce it.