Another set of underlying ideas is psychomotor patterning, also known as the Doman-Delacato theory of development, which claims that if motor skills are not acquired in the correct order, the result will be a lifelong deficit in learning ability, and also claims that these deficits can be overcome by going back and learning the skipped skills; this theory and claims to improve learning based on it were discredited in the 1970s and 1980s. An example of this in the Brain Gym method, is to have children practice crawling.