But on this day, something happened: Jordan, the boy she has a crush on, said hi to her in the hallway!He'd never done that before, and Kelly was so excited that he finally noticed her! She was wearing a new outfit, so maybe that was it.
But she had also changed her hair, so maybe that's why he said hi.
Or perhaps it was the fact that she smiled at him as he walked down the hall.
That is the hallmark of the formal operational period of development, according to Piaget.
Though mental manipulations are the hallmark of formal operations, they aren't the only way that thinking changes in adolescence.
Piaget found that younger children would randomly change variables without thinking things through, while adolescents capable of formal operations would systematically change one variable at a time to see how it affected the swing speed of the pendulum, much in the same way that Kelly and her friends are experimenting with what captures Jordan's attention.
Adolescence is the period of life between childhood and adulthood.As a member, you'll also get unlimited access to over 79,000 lessons in math, English, science, history, and more.Plus, get practice tests, quizzes, and personalized coaching to help you succeed.Many changes occur during this time, including cognitive development.Psychologist Jean Piaget called the cognitive development changes during adolescence the formal operations stage, during which adolescents become adept at mentally manipulating the world around them and systematically manipulating variables during scientific experimentation.She puzzles over it and then gives him her answer at breakfast.Kelly is in adolescence, or the time between childhood and adulthood. They grow taller and start to look more and more like adults.Kelly and her friends have become very good at figuring out the world around them.For example, one day, Kelly went to school like normal.Let's look closer at what formal operations are, how they develop in adolescence and what they have to do with scientific experimentation. Well, not too long ago, her father read Kelly this problem: 'Jonah is taller than Mia and shorter than Gene. ' A few years ago, Kelly wouldn't have been able to figure out the answer to that problem without drawing Jonah, Mia and Gene on a piece of paper.But now that she's able to perform formal operations, Kelly doesn't have to draw the characters on paper.