Ghost Illusions: The Science Behind Afterimages

The video explores the concept of ghost illusions, which are images that persist in one's vision even after the original image is no longer visible. These illusions are likened to seeing ghosts. The video provides examples, such as Yorick's skull, and explains the types of after images: positive, where colors remain the same, and negative, where colors are inverted. It also discusses the brain's role in maintaining visual continuity, ensuring the world doesn't go dark when we blink.

What are ghost illusions?

• Hallucinations caused by supernatural beings

• Visuals that persist after the original image is gone

• Images that appear only in dreams

• Images that can only be seen in the dark

In the Yorick's skull experiment, what are you expected to see after looking at the image?

• Nothing at all

• An image of a skull

• A different image

• A blank surface

What is a characteristic of positive afterimages?

• They show inverted colors

• They appear only in the dark

• They are always black and white

• They maintain the original colors

How do negative afterimages differ from positive ones?

• They appear only when you close your eyes

• They show the same colors as the original

• They are brighter than the original image

• They display colors inverted from the original

Why does our brain keep images illuminated when we blink?

• To enhance our vision in low light

• To help us remember images better

• To prevent the world from going dark

• To create ghost illusions