The best evidence for the existence of the g factor are IQ tests, and IQ tests are optimized to measure the g factor. Do you see a problem there? The g factor

The best evidence for the existence of the g factor are IQ tests, and IQ tests are optimized to measure the g factor. Do you see a problem there? The g factor—or more descriptively—the theory of general intelligence has little support outside of the field of psychometrics. And the field of psychometrics is not known for it’s scientific rigor. Needless to say, there is little reason to believe that the theory of general intelligence has any grounds in reality, nor that the g factor exists outside of an operationally defined concept that might not hold any descriptive power for human behavior outside of a narrow setting of pen and paper tests.