Von Restorff effect
The von Restorff effect, also called the isolation effect, says that an item that stands out from its surroundings is remembered better than the rest. The German psychiatrist Hedwig von Restorff showed it in 1933 with lists in which one item looked different. For studying, a few distinctive cues help, and many cues cancel each other out.
In more detail
In her experiments von Restorff gave people lists of similar items with one item made different, for example a number among syllables. The different item was recalled better than its neighbors. Later studies changed font, color or size and found the same pattern, and the effect has been found again many times.
Why does it work? A distinctive item gets more attention, and it is easy to tell apart from the others when you try to recall it. The effect is related to the serial position effect, but the two are separate: the first and last items of a list are remembered because of where they sit, while an isolated item is remembered because of how it looks.
The catch for students is that distinctiveness is relative. One yellow line on a page stands out. A page that is yellow from top to bottom has no isolated item, so the effect is gone. Highlighting, boxes and odd mnemonic images only work when they are rare. Use them for the five or six facts you keep forgetting, not for everything.
Cues that make an item stand out
| Cue | Works when | Backfires when |
|---|---|---|
| One highlighted line per page | You mark only the fact you keep forgetting | Most of the page is highlighted |
| A vivid or odd image in a mnemonic | The image is unusual and tied to the fact | Every item gets its own wild image and they blur together |
| A different color for one kind of card | One color marks one thing, such as formulas | Many colors with no clear meaning |
Example
A student writes eight vocabulary words on a sheet. Seven are in black. "Ephemeral", the one she keeps forgetting, is in red with a small sketch of a mayfly. A day later it is the word most likely to come back. Had all eight been red with sketches, none would have stood out.
How to use it
- 1
Find your trouble items: the five or six facts, terms or formulas you keep getting wrong.
- 2
Give only those a distinctive cue: a different color, a box or a vivid drawing tied to the meaning.
- 3
Keep everything else plain. Count your highlights per page and cap them at two or three.
- 4
Make the cue meaningful. A red formula should always mean "formula", because random decoration does not help.
- 5
Test yourself without the cue, for example with flashcards, and drop the cue once the item sticks.
How StudyPDF does this
StudyPDF helps you spend distinctiveness where it counts. Quiz results list your weakest concepts first, so you know which few items deserve a special cue. Figures from your slides can sit on either side of a flashcard, and image-occlusion cards hide the labels of a diagram so you recall each one. Cheat sheets and flashcards export to PDF, so you can mark just those few by hand.
See also
Put it to work on your own course
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Common questions
What is an example of the von Restorff effect?
In a list of ten black words with one written in red, people tend to recall the red word best. The same happens when one bright button stands out on a page of gray ones: it is the one people remember.
Is the von Restorff effect the same as the isolation effect?
Yes. They are two names for the same finding: an item that differs from its context is remembered better. Von Restorff effect honors the researcher, and isolation effect describes the situation.