It is known that speech in boys begins to form later than their peers. In General, development of the psyche of boys takes place with a slight delay, which is considered normal.
This question has interested a group of Norwegian scientists. In the study, they made a conclusion regarding the effect of the hormone testosterone on the development of speech. The study involved boys aged up to five years. Scientists have covered 10 of thousands of children. The results are published in the International Journal of Language & Communication.
High level of testosterone inhibits brain development. In addition, the increased level of the hormone can serve as one of the causes of autism. The urgency of the problem, say the authors, is quite high. In recent years, the incidence of this disease is much more frequent.
In the course of this research experts have proven that the frequency of speech disorders in boys under the age of five years is about twice compared with the same group of girls.