Motion perception plays a fundamental role in our daily visual experience; it is critical for computing the speed and direction of moving objects and controlling our own body and eye movements. Motion ...

Hallucinogen persisting perception disorder (HPPD) is a rare medical condition that can cause visual disturbances (sometimes called flashbacks) if you’ve taken hallucinogenic drugs in the past. With ...

The motion aftereffect, sometimes referred to as the "waterfall illusion," is one of the oldest visual illusions ever discovered, dating as far back as Aristotle. When we are exposed to a continuously ...

The brain has an astonishing capacity to detect patterns in the world. So much so, that it will often create patterns where none exist. Pareidolia is the tendency to see familiar shapes in random ...

In the 1860s, physician Hermann von Helmholtz did a simple experiment to understand how the world stays still during eye movements. With a still head, he closed one eye and swiveled the other to look ...