There has been a stunning rise in IQ over a 36 year period from 1965-2001 in Dominica. There was an 18 point rise during this period, which raised their IQ’s from 61 to 73. The IQ level in Dominica did not rise by 18 points because other groups’ IQ’s were also rising during this period. This represents a gain against UK Whites of 12 IQ points.
The test used was Raven’s Progressive Matrices, a test that is said to be the best available for measuring pure “g” intelligence. It also predicts success in life in various ways pretty well and is not culturally biased in any way. The researchers gave a vocabulary test to a group of Dominicans and found a similar rise of about 18 IQ points on that test.
English Researchers tried to tease out which factors were most related to the IQ rise, but the only factor that explained the rise fairly well was schooling, so it appeared that improved schooling was a major cause of the IQ rise. The IQ rise occurred at the time of a major expansion of the school system in Dominica.