KE family

The KE Family has a genetic mutation that causes them to have problems with speech. The family was studied to try to find a gene responsible for language production. Some argue that this gene, FOXP2 is responsible. Others argue that their difficulty in speaking is not the result of a problematic language-specific gene. This argument is based on the fact that in addition to problems with speech and grammar, they also have trouble with certain motor skills.

See MacWhinney p. 6