A scientific research institution in a country tracked and studied the mental health of more than 10,000 people born in the 1950s to 1970s, and tested their language ability, spatial perception ability and inductive ability from 13 to 18 years old  The results found that, during this period, adolescents whose language ability is much lower than their peers are at higher risk of developing schizophrenia and other mental diseases in adulthood
Abnormal levels of hormone secretion in adolescence affect brain development and lead to delayed language development.
 Researchers believe that the level of language ability in adolescence will be an important indicator of predicting mental illness in adulthood