Quizlet AND What is a "sensitive period" of development? when the child is most sensitive to instruction when it is most difficult for development to occur when a particular development occurs most easily when the child is developing emotional control.

when a particular development occurs most easily

Explanation:

Sensitive periods as originated by Dutch geneticist Hugo de Vries and used by the Italian educator Maria Montessori describes overlapping periods of development where a child is unconsciously sensitive to certain interactions. Usually from birth to 6yrs, this stage is characterized by a child's unconscious abilities to learn from his environment and is able to acquire certain knowledge without even knowing it.