Technology may be getting smarter, but humans are getting dumber, scientists have warned.
Evidence suggests that the IQs of people in the UK, Denmark and Australia have declined in the last decade.
Opinion is divided as to whether the trend is long-term, but some researchers believe that humans have already reached intellectual peak.
And standard tests issued in the UK and Australia echo the results, according to journalist Bob Holmes, writing in New Scientist.
The most pessimistic explanation as to why humans seem to be becoming less intelligent is that we have effectively reached our intellectual peak.
Between the 1930s and 1980s, the average IQ score in the US rose by three points and in post-war Japan and Denmark, test scores also increased significantly – a trend known as the ‘Flynn effect’.
This increase in intelligence was due to improved nutrition and living conditions – as well as better education – says James Flynn of the University of Otago, after whom the effect is named.