What Science Says About Word Puzzles and Brain Health

The idea that mental exercise keeps the brain young is appealing, and like most appealing ideas, the reality is more nuanced than the headlines. Word puzzles are not a cure for anything, and the evidence that they prevent dementia is weak. But they do genuinely exercise several mental skills, and there are good reasons to enjoy them. Here is what the research does and does not say.

What a word puzzle actually exercises

When you look at the letters AEILNRT and try to find a seven-letter word, you are doing several things at once. You hold the letters in mind, generate possible combinations, check them against the words you know, discard the failures and try again. That draws on working memory (the mental workspace where you hold and handle information), on vocabulary, and on attention.

In other words, a word puzzle is a small, absorbing workout for the same skills you use whenever you search for the right word in conversation.

Can brain training make you smarter?

In 2008, a widely publicised study by Susanne Jaeggi and colleagues reported that training on a demanding working-memory task improved performance on reasoning tests. It sparked a great deal of excitement, and a whole industry of brain-training apps.

Later research has been much more cautious. Larger reviews of many studies have generally found that people get better at the specific tasks they practise, but that the improvement rarely spreads to broader abilities in everyday life. The honest summary: you will get better at word puzzles by doing word puzzles. Whether that makes you sharper at everything else is not established.

Vocabulary and age

Here the news is genuinely encouraging. Different mental abilities peak at different ages. Processing speed is typically fastest in early adulthood, but vocabulary keeps growing for much longer. Large studies have found that vocabulary knowledge often continues to improve into people's sixties and seventies.

Word puzzles are one pleasant way to keep meeting new words and to keep using the ones you know.

What about dementia?

Some observational studies have found that people who regularly do puzzles, read and engage in other mentally stimulating activities tend to have better thinking skills in later life. But these studies cannot show cause and effect. It may be that people with sharper minds simply enjoy puzzles more, or that puzzle-lovers also differ in education, health and lifestyle.

Research has not convincingly shown that word puzzles on their own prevent or delay dementia. If you have concerns about your memory, the right step is to talk to a doctor, not to do more puzzles.

Why enjoyment still matters

None of this means puzzles are pointless. Mental activity you enjoy is mental activity you will actually keep doing. A daily puzzle gives you a few minutes of focus, a small sense of achievement, and, if you share it, something to talk about with friends and family. Those are good reasons on their own.

That is why we designed our daily puzzle to be calm, with no timer, no scores and no streaks: it is meant to be enjoyed, not endured.

This article is for general interest and is not medical advice.

Related reading: Word games for seniors

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