According to Montessori’s research, the “absorbent mind” is the time in a child’s life from birth to 6 years, when the child absorbs everything in the environment completely and unconsciously, without choice or bias, positive or negative, regardless of, and according to, the child’s culture.
“The developing child not only acquires the faculties of man: strength, intelligence, language; but, at the same time, he adapts the being he is constructing to the conditions of the world about him. And this it is that gives virtue to his particular form of psychology, which is so different from that of adults. The child has a different relation to his environment from ours. Adults admire their environment; they can remember it and think about it; but the child absorbs it. The things he sees are not just remembered; they form a part of his soul. He incarnates in himself all in the world about him that his eyes see and his ears hear. In us the same things produce no change, but the child is transformed by them.” -from The Absorbent Mind, 2007, Montessori-Pierson Publishing Company, p. 56.