Critical Period Theory

The theory of critical periods is a theory according to which in the development of the embryo and its individual rudiments there are periods of greatest sensitivity to the action of physical and chemical factors.

According to this theory, at certain periods of time critical processes occur in the development of the body, the disruption of which can lead to serious deviations in the formation of the structure or function of the organ. These intervals are called critical periods.

Critical periods are characterized by increased sensitivity of developing organs and tissues to the action of various teratogenic factors - chemicals, radiation, hormonal disorders, etc. Exposure to these factors during critical periods of development can lead to irreversible changes and anomalies.

The theory of critical periods is important for understanding the patterns of embryonic development and the causes of birth defects. It allows us to identify the most vulnerable stages of ontogenesis that require special protection from damaging influences.

In nature, there are a number of circumstances when an external factor threatens the existence of an organism. Some individuals are able to adapt and survive under the adverse influence of other objects. To do this, their organisms adapt to such changes and become more stable, while other organisms that cannot adapt to changing