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  2. Piaget's theory of cognitive development - Wikipedia

    en.wikipedia.org/wiki/Piaget's_theory_of...

    Children's inability to focus on two aspects of a situation at once inhibits them from understanding the principle that one category or class can contain several different subcategories or classes. [43] For example, a four-year-old girl may be shown a picture of eight dogs and three cats.

  3. Three mountain problem - Wikipedia

    en.wikipedia.org/wiki/Three_mountain_problem

    The results showed that children as young as three-years-old were able to perform well, and they showed evidence of perspective-taking, [10] the ability to understand a situation from an alternate point of view. Hence, evaluation of Piaget's Three Mountain Problem has shown that using objects more familiar to the child and making the task less ...

  4. Visual cliff - Wikipedia

    en.wikipedia.org/wiki/Visual_cliff

    During early development, infants begin to crawl, sit, and walk. These actions impact how the infants view depth perception. Thus, infant studies are an important part of the visual cliff. When an infant starts to engage in crawling, to sit, or walking, they use perception and action. During this time, infants begin to develop a fear of height.

  5. Infant cognitive development - Wikipedia

    en.wikipedia.org/wiki/Infant_cognitive_development

    Preoperational Stage (24 Months to 7 Years) Concrete Operational Stage (7 Years to 12 Years) Formal Operational Stage (12 Years and Up) Infant cognitive development occurs in the Sensorimotor stage which starts at birth and extends until the infant is about 2 years of age. The sensorimotor stage is made up of six sub-stages.

  6. Object permanence - Wikipedia

    en.wikipedia.org/wiki/Object_permanence

    Object permanence is the understanding that whether an object can be sensed has no effect on whether it continues to exist.This is a fundamental concept studied in the field of developmental psychology, the subfield of psychology that addresses the development of young children's social and mental capacities.

  7. Child development stages - Wikipedia

    en.wikipedia.org/wiki/Child_development_stages

    Resting heart rate is usually between 80 and 160 beats per minute, and it typically stays within that range until the infant is about one year old. [18] Motor development. Can hold up head and chest while in prone position. [24] Movements of arms and legs become smoother. [25] Can hold head steady while in sitting position. [24]

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