IQ (Score 1)

This isn't so much new, but has been the basis for numerous theories and ideas emerging in the field of psychology. Motivation is the foundation of everything we do. While IQ test aren't the most accurate measure of "intelligence" they are the best we have in the field right now. They are highly subjective and difficult to measure. However, they do measure cognitive ability and other broad facets of human processing which is very useful. As for the concept of "intelligence", do a quick search for Carrol Dwek. Her research on intelligence is ground breaking and insightful. She tests the idea that there are growth theories of intelligence and entity theories present among people. Entity theory states that people adopt the idea that intelligence is fixed; whereas growth theory postulates that people believe intelligence is malleable and can be built-upon. These theories have been put to the test where people are induced to be an entity theory or growth theory. They find that people with growth theories have more persistence, motivation to succeed, and learn things for the sake of learning them - not because they are persuaded by external rewards like money. This suggests that people can learn to be more intelligent through persistence. So, I could see IQ tests as measuring motivation.