Penguin Books Ltd., 1977 Great Britain. Penguin Education. Translates by Margaret Cook. 8º (18×11,5 cm) 464 págs. Rústica ilustrada. Cubierta deslucida, sobada con manchas de uso. Lomo con doblez propia de lectura. Esquinas rozadas con faltas. Amarilleo de las páginas. Signos de uso. Nombre del anterior propietario. «In this book, Piaget gives account of the origins of intelligence in human beings. Using numerous observations and examples from his work with young children, the author discovers the stages of the sequence from simple reflexes to more complex levels of comprehension. He believes that mental faculties develop through being used, and that impressions received enable the intelligence to grasp more involved concepts in an upward spiral. The theory is applied to the early sucking reflexes of the infant as well as to the highest forms of creative intelligence.»