IQ scores should be taken with a pinch of salt when it comes to measuring intelligence, according to new research from the US.
That is because scores are affected as much by motivation as they are by intelligence, researchers at the University of Pittsburgh found.
Writing in the journal Proceedings of the National Academy of Science, they claimed that incentives have a significant impact on IQ scores, particularly among those who would otherwise have scored more poorly.
They used the results to suggest that students with poorer IQ scores may be less inclined to do well, rather than simply being less intelligent.
"After adjusting for the influence of test motivation, however, the predictive validity of intelligence for life outcomes was significantly diminished, particularly for non-academic outcomes," the team concluded.
The news comes shortly after a survey by the Association of Teachers and Lecturers indicated that good exam results at degree-level do not necessarily serve as an indication of how well teachers will perform in the classroom.