10.8
Piaget's fourth and last stage of cognitive development is the formal operational stage which begins around age 11 and continues through adulthood.
This stage involves more abstract and logical thinking than the concrete operational stage.
At this stage, adolescents solve problems using hypothetical-deductive reasoning rather than trial and error. They generate all possible hypotheses, solutions, and predictions and then systematically test each to determine the best solution.
For example, in a pendulum-related experiment, adolescents were given strings of different lengths, objects of varying weights, and a bar for hanging the strings. This allowed them to investigate what factors influenced pendulum speed. They tested one variable at a time and concluded that string length determined the pendulum's speed.
Further, adolescents experience a renewed egocentrism, where heightened self-consciousness leads them to believe that others are as focused on their lives as they are.
For instance, a 15-year-old with a small pimple may think it is highly noticeable, mistakenly assuming others share the same perception.
ピアジェの認知発達理論で説明されている形式的操作期は、11 歳前後から始まり、成人期まで続きます。これは、青年期および成人期の思考を幼い子供の思考と区別する高度な認知能力の出現を示します。この段階は、抽象的推論、仮説演繹的推論、および自己と他者に対するより複雑な理解によって特徴付けられます。
抽象的…
著作権 © 2026 MyJoVE Corporation. 無断転載を禁じます。