Seen It? How Recognition Memory Works

Have you ever recognised a face instantly but failed to remember the name? Recognising something is usually much easier than recalling it. Seen It? tests the recognising side.

How to play

Shapes appear one at a time. For each one, answer SEEN if it already appeared in this level, or NEW if not. Click the buttons or press S and N. There are 7 levels of 12 shapes, and each level adds shapes, colours and outlines, so look-alikes get closer. Three mistakes end the test.

Where it comes from

Recognition memory has been studied for decades with tasks like this, where items keep coming and you judge each one as old or new. Classic experiments found that people can recognise an enormous number of pictures; in one 1973 study, people correctly recognised most of 10,000 pictures they had seen once.

Why look-alikes are hard

Recognition is easy when items are very different. When they share colour, shape or outline, your memory has to keep fine details, and similar items interfere with each other. That is what makes the later levels hard.

What practice can change

You will improve at this task, partly by learning which details to notice. Wider benefits are not proven.

A worked example

On a level where shapes vary in colour and outline, suppose you see a filled blue star, then an outlined blue star. They look alike, but they are different items, so the second is NEW. Picking one detail to check every time, such as filled or outlined, helps you avoid answering SEEN for look-alikes.

Common mistakes

Answering by feel when a shape looks familiar is the biggest one: similar shapes create false familiarity. Answering too fast on later levels is another. And forgetting that each level starts fresh can cause mistakes on the first few shapes.

Questions people ask

Why is recognising easier than recalling? Recognition can rely on a feeling of familiarity, while recall requires pulling the memory out yourself.

Why does it work in any language? It uses shapes and colours only, no words.

Does practice help? Yes, mostly by learning which details to check.

Tips

For each shape, notice one detail: its colour or whether it is filled. Not medical advice.