Intelligence is effected by the environment one grows in, proves an analysis of 124 studies published in the January issue of Psychological Review. Dennis Garlick, of the University of Sydney in Australia, says that the neural plasticity model of intelligence better explains how intelligence is developed. His model suggests that intelligence is created when neural connections in the brain change in response to environmental cues. Intellectual abilities require different neural connections in the brain and the brain can grow such connections only by adapting to environmental inputs.