In later writings, Piague allowed a stronger influence of culture on cognitive development, a greater variety of phenomena within the stages of the intellect. Piaje also assumes that without an appropriate cultural environment one can never manage to master complete formal operations. The so-called constructivist moments of his model of development were reinforced in the late Piage. 


![leonardo-da-vinci-pregnant.jpg](https://cdn.steemitimages.com/DQmUDaPMuJh2j5vD2Ly4LJZxGJRdZYTcHoYWtH5vPgTccfe/leonardo-da-vinci-pregnant.jpg)
[image source](https://orvostudomany.blog.hu/2012/02/28/indulunk_800)

Simply put, this means that the child actively creates his world and his ideas for him. He has combined the gift of a great theorist with the gift of a brilliant experimenter. He has proposed the most well-founded theory of the child's intellectual development. His theoretical ideas have an extraordinary authority because they are skillfully supported by hundreds of exquisite and simple experiments that explore many aspects of childhood thinking. These exemplary experiments are known in world psychology as Piage phenomena.The latter can be divided into three groups: 1 / phenomena related to the genesis of logical operations; 2 / phenomena showing the development of life concepts in children and 3 / phenomena of preservation of physical properties of objects - weight, volume, area, substance etc. The third group of phenomena establishing the preservation have the most popular and often effective are merged into children's psychology textbooks; d) Psychoanalytic theories. 

According to Freud, the sexual instinct lies at the heart of human development. In psychoanalysis, this concept has a broad meaning. He thinks that the sexual instinct is the total life energy, the instinct for life that does not appear until the maturation period, and then only acquires the most mature form associated with the continuation of the genus. Psychologically, the essence of this instinct is that, as with animals, the body of individuals of the same species, as well as their own body, is the source of some enjoyment and pleasure. To mark this aspect of the sexual instinct Freud uses the libido formula. Libido (sexual energy) has the ability to focus on various areas of the human body that Freud calls erogenous during the various stages of development. Focusing on a particular area strengthens the experience of pleasure through it, focuses on it and boosts development. Depending on the focus of libido on a particular erogenous zone, Freud gives specific names of the age stages: Oral stage - infancy; Anal stage - early childhood; Phallic stage - pre-school age; Latent stage - primary school age; Genital stage - puberty / adolescence /.