There is ongoing debate among academics, even in Norway... In 2019, a group of researchers from the University of Oslo published a study that found no evidence

There is ongoing debate among academics, even in Norway... In 2019, a group of researchers from the University of Oslo published a study that found no evidence of a decline in IQ scores over time in Norway, despite claims of such declines in other countries. The researchers argued that the methodology used in previous studies may have contributed to false conclusions about declining IQ scores. In contrast, a group of researchers from the University of Amsterdam published a study in 2018 that reported a decline in IQ scores in the Netherlands over the past several decades. The researchers suggested that changes in educational systems, such as increased emphasis on testing and memorization, may be contributing to the decline.