This paper examines Jean Piaget's theory of cognitive development, tracing how children's thinking evolves through four sequential stages: sensorimotor (birth to 2 years), preoperational (2–7 years), concrete operational (7–11 years), and formal operational (puberty onward). The paper explains key concepts at each stage, including object permanence, symbolic thought, egocentrism, conservation, and abstract reasoning. Drawing on Piaget's foundational ideas about assimilation and accommodation, the discussion illustrates how children's interactions with their environment change as they progress through each stage, using concrete examples to clarify complex developmental concepts.
The paper demonstrates effective use of illustrative examples to support theoretical claims. Rather than simply defining each stage, the author anchors each concept — such as egocentrism or symbolic thought — in a specific behavioral scenario, a technique that strengthens reader understanding and reflects how developmental psychology textbooks present theory.
The paper opens with a brief theoretical overview of Piaget's framework, then moves chronologically through each of the four stages in dedicated sections. Within each stage, the author introduces defining characteristics, explains relevant sub-concepts, and provides illustrative examples. The paper concludes with the formal operational stage, framing it as the endpoint of cognitive maturity. This linear, stage-by-stage structure closely matches the logical progression of Piaget's original theory.
According to Jean Piaget, the processes of assimilation and accommodation continue throughout life. He nevertheless believed that cognitive development takes place sequentially — one stage after another — in all children at roughly the same age. At each phase of cognitive development, children's outlooks and interactions with their environment tend to vary. Piaget identified four stages of cognitive development: the sensorimotor, preoperational, concrete operational, and formal operational stages (Nevid, 2009).
Comprising six sub-stages, the sensorimotor stage is characterized by considerable growth in the infant's cognitive development. A child at this stage develops increasingly complex skill sets and behavioral repertoires. The infant uses its senses along with developing motor skills to explore its environment, and its intelligence is expressed through action and deliberate manipulation of objects (Nevid, 2009).
From birth to approximately one month, a child's behaviors are confined to inborn reflexes such as grasping and sucking. From month 1 to month 8, the infant begins to gain voluntary control of its movements and becomes able to grasp objects near its crib. From month 8 to month 12, the infant's actions tend to become goal-oriented. By about 8 months, the child begins to search for hidden objects — a behavior linked to a concept called object permanence. Object permanence refers to the understanding that objects continue to exist even when they are out of sight. Piaget believed that object permanence is not fully developed at this early point; it reaches maturity in the later sub-stages of the sensorimotor period. At this point, the child also begins to develop the capacity to form mental representations of objects that are not visually present (Nevid, 2009).
From ages 2 to 7, children become able to think about objects that are not physically present, because they now have mental representations of images and symbols. However, they are not yet capable of imagining how something would look from another person's perspective, solving problems by systematically trying different approaches, reflecting on their own thoughts, or performing mental operations (Steinberg, 2010).
Children at this stage can think symbolically about things and use language in more mature ways. Because memory and imagination develop, they can engage in fantasy and distinguish between past and future. Their thinking is not yet fully logical, however, and they may struggle to understand concepts such as cause and effect, comparison, or time (WebMD.com, 2012).
Piaget used the term preoperational to describe this stage precisely because children at this point are unable to carry out fundamental logical operations. Nevertheless, notable growth occurs in children's ability to create mental and symbolic representations of their environment (Nevid, 2009).
This symbolic capacity is expressed especially through language. The child creates symbolic representations of things and experiences by naming them or using words to describe objects and events. Language therefore allows the child to think more efficiently than was possible during the sensorimotor stage (Nevid, 2009).
Symbolic thought — the ability to represent things using symbols — is a critically important development during this stage. Language development is one of its most significant outcomes. At the start of the preoperational stage, a child's language abilities are limited; the child may be able to speak but cannot yet read or write (Boyd, n.d.).
This is because reading and writing depend directly on symbolic thought. Written language is inherently symbolic: a child must understand that letters represent sounds, words represent objects, and sentences represent ideas. Children who have not yet developed symbolic thought are therefore unable to decode written language (Boyd, n.d.).
Another illustration of symbolic thinking appears in pretend play. During such play, children create mental representations that allow them to enact scenes featuring characters who are not physically present. The complexity of pretend play grows as the stage advances. By ages 5 or 6, children are creating scenes with fantasy characters or reenacting episodes from movies and television (Nevid, 2009).
Despite significant expansion of cognitive abilities during this stage, Piaget observed that the child's thinking remains limited in important ways. One notable limitation is egocentrism — the tendency to view the world exclusively from one's own standpoint (Nevid, 2009).
Egocentric thinking does not mean the child is inconsiderate of others; rather, the child simply lacks the cognitive capacity to factor in another person's perspective. The child perceives him- or herself as the center of attention. For example, a five-year-old girl might want her mother to play with her without understanding that her mother is tired and needs rest (Nevid, 2009).
An illustrative example of egocentric thinking involves a professor whose son, while on the phone with his father, asked whether his breath smelled like M&Ms. The professor replied that he could not smell it from where he was. The son, Spencer, simply told him to try again — unable to grasp that distance made this impossible (Nevid, 2009).
Another characteristic of the preoperational stage is animistic thinking — the belief that inanimate objects such as the sun, clouds, and moon possess living qualities like feelings, wishes, and thoughts. A child of this age might, for example, believe that the moon is a friend and follows them as they walk home at night. The same professor recounted that his son, at age 3, cried during laundry day and asked his mother to turn off the washing machine because "the clothes will drown" (Nevid, 2009).
The preoperational child is also limited by two additional cognitive tendencies. The first is irreversibility — the inability to mentally reverse a sequence of events back to its starting point. The second is centration — the tendency to focus on only one aspect of a situation at a time, excluding all others. Piaget demonstrated both principles using his classic conservation tasks (Nevid, 2009).
In one such task, the child is shown two identical glasses of water. The water from one glass is then poured into a shorter, wider glass. The child insists that the shorter glass contains less water. Due to centration, the child focuses solely on the height of the water column; due to irreversibility, the child does not recognize that the process can be undone by pouring the water back into the narrower glass (Nevid, 2009).
Children at this stage also use language in less sophisticated ways. They tend to confuse objects with the words used to name them. If a child named Benjamin calls a toy block a "car" and the same block is then used to build a "house," he may become upset — because he views the name as an intrinsic part of the object. This also helps explain why name-calling can be so distressing to young children; to a child at this stage, an insulting word feels like a direct attack (Coon, Mitterer, Talbot, & Vanchella, 2010).
Boyd, N. (n.d.). Piaget's preoperational stage and symbolic thought. Retrieved September 22, 2014, from
Coon, D., Mitterer, J. O., Talbot, S., & Vanchella, C. M. (2010). Introduction to psychology: Gateways to mind and behavior. Belmont, CA: Wadsworth Cengage Learning.
Nevid, J. S. (2009). Psychology: Concepts and applications. Boston: Houghton Mifflin.
Steinberg, L. D. (2010). Life-span development. Belmont, CA: Wadsworth.
WebMD.com. (2012). Children's health: Piaget stages of development. Retrieved September 22, 2014, from http://www.webmd.com/children/piaget-stages-of-development
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