[FONT=Geneva,Arial]Piaget's four stages:[/FONT]
[FONT=Geneva,Arial]Sensorimotor stage:[/FONT]
[FONT=Geneva,Arial]Preoperational stage:[/FONT]
[FONT=Geneva,Arial]Concrete Operations:[/FONT]
[FONT=Geneva,Arial]Formal Operations:[/FONT]
[FONT=Geneva,Arial]Sensorimotor stage: from birth until about two years of age. At this age children are only aware of objects that are directly[/FONT][FONT=Geneva,Arial] before them, thus the saying, "out of sight, out of mind." (Example: The game of "peek-a-boo" is enjoyed only by infants. Their joy in this game comes from their "finding" the adult -- who"hides" by blocking the child's view and thus "disappears" and "re-appears" as the child experiences it.)
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[FONT=Geneva,Arial]Preoperational stage: emerges when children are about two years old until they are about six to seven years old. This is the stage oflanguage development. Expanding childrens’ vocabularies reflect the many new mental schemes that are developing. This stage is characterized by a logical thinking, but not according toadult standards. A classic example is how young children cannot understand conservation of liquid. They will usually think that a taller glass has more water than a short glass even though both have been demonstrated to have the exact same amount of water.[/FONT]
[FONT=Geneva,Arial]Concrete operations: this third stage of cognitive development appears when children are six or seven years old and continues until they are about 11 or 12 years old. Children begin to think logically about conservation problems and other situations as well. However, they typically can applytheir logical operations only[/FONT][FONT=Geneva,Arial] to concrete, observable objects and events.[/FONT]
[FONT=Geneva,Arial]Formal operations: the fourth and final stage usually appears after children are 11 or 12 years of age and continues to evolve for several years after that time. During this time the child develops the ability to reason with abstract, hypothetical, and contrary-to-fact information.[/FONT]
[FONT=Geneva,Arial][It must be noted that some recent research does not confirm Piaget's four stages in their entirety.][/FONT]