Montessori described the young child’s behavior of effortlessly assimilating the sensorial stimuli of his or her environment, including information from the senses, language, culture, and the development of concepts with the term “absorbent mind” She believe that this time is a power unique to the first plane, and that it fades as the child approaches age six.
Montessori observed and discovered periods of special sensitivity to particular stimuli during the time which she call the “sensitive periods”. In Montessori education, the classroom, environment responds to these periods by making appropriate materials and activities available while the periods are active in each individual young child.
Finally, Montessori observed in children from three to six years old a psychological state she termed “normalization”. Normalization arises from concentration and focus on activity which serves the child’s developmental needs, and is characterized by the ability to concentrate as well as “spontaneous discipline” continuous and happy work, social sentiments of help and sympathy for others.