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What is the 'Halo effect'? A recent arcticle published on the BBC News website describes the findings from a Canadian team of researchers from Carleton University

It takes less than 50 milliseconds to decide if you like a website Internet users make up their minds about the quality of a website in the blink of an eye, a study shows.

Researchers found that the brain makes decisions in just a twentieth of a second of viewing a webpage.

They were surprised as they believed it would take at least 10 times longer to form an opinion.

The study, published in the journal Behaviour and Information Technology, also suggests that first impressions have a lasting impact.

Speedy conclusions

The Canadian team showed volunteers glimpses of websites, lasting for only 50 milliseconds.

My colleagues believed it would be impossible to really see anything in less than 500 milliseconds Gitte Lindgaard, Carleton University

The volunteers then had to rate the websites in terms of their aesthetic appeal. The researchers found that the speedily formed conclusions closely tallied with opinions of the websites that had been made after much longer periods of examination.

Gitte Lindgaard of Carleton University in Ottawa, Canada, and lead researcher of the paper expressed her surprise at the results. "My colleagues believed it would be impossible to really see anything in less than 500 milliseconds,"she told the website of the Nature journal, which reported the research. The judgements were being formed almost as quickly as the eye can take in information.

Lasting impressions

The researchers also believe that these quickly-formed first impressions last because of what is known to psychologists as the 'Halo effect'. If people believe a website looks good, then this positive quality will spread to other areas, such as the website's content.

Since people like to be right, they will continue to use the website that made a good first impression, as this will further confirm that their initial decision was a good one.

As websites increasingly jostle for business, Dr Lindgaard added that companies should take note.

"Unless the first impression is favourable, visitors will be out of your site before they even know that you might be offering more than your competitors," she warned.