According to Jean Piaget, during which period of cognitive development is thinking generally described as egocentric and illogical?

In the concrete operational stage, typically occurring between ages 7 and 11, children begin to think logically about concrete events. They can understand concepts of conservation and perspective, leading to a significant reduction in egocentric thinking, which distinguishes this stage from the preoperational stage.

The formal operational stage, starting around age 12, is when individuals develop the ability to think abstractly and logically. They can formulate hypotheses and think about hypothetical situations, moving beyond the illogical and egocentric tendencies found in the preoperational stage.

The sensorimotor stage occurs from birth to about 2 years old, where infants learn about the world primarily through their senses and actions. This stage is focused on object permanence and motor skills rather than cognitive egocentrism or illogical reasoning, making it distinctly different from the preoperational stage.

Postconventional is a term associated with moral development, not cognitive development. It refers to the stage wherein individuals make moral decisions based on abstract reasoning and principles rather than concrete rules. This concept is unrelated to Piaget's stages of cognitive development.