Count the hand taps

Visual Attention Demo

Your task is simple: watch the seated person and count how many times the hand taps the desk.

Focus on the tapping hand and keep an accurate count.

When the clip ends, you will be asked a brief question about what you saw.

What changed?

First, enter the number of taps you counted. Then describe anything else you noticed changing in the scene.

Number of taps counted What changed?

Visual Attention Task

Watch the scene carefully and count the hand taps. Try to keep your attention on the counting task throughout the clip.

StatusReady

TaskCount taps

What this demonstrates

This is a demonstration of change blindness: large changes can be missed when attention is engaged elsewhere at the moment the change occurs.

The implication is that human perception is not a complete photographic recording of the world. Conscious visual experience depends on attention, task demands, memory, expectations, and the way the visual system samples and updates information over time.

In everyday life this matters for driving, eyewitness memory, teaching, interface design, safety monitoring, and any situation in which people assume they will automatically notice important changes just because those changes are large.