According to Piaget's theory, what is the stage of cognitive development where children can think logically about concrete objects and events?

In Piaget's theory of cognitive development, the stage where children can think logically about concrete objects and events is known as the concrete operational stage. This stage typically occurs between the ages of 7 and 11 years. During this period, children become capable of performing operations on tangible objects and can understand the concept of conservation (the idea that quantity doesn't change even when its shape does). They begin to think logically about concrete situations and can classify objects according to different characteristics, such as size or color.

This understanding allows them to solve problems related to physical objects and situations they can observe. For instance, they can understand that if you pour water from a tall, thin glass into a short, wide one, the amount of water remains the same even though its appearance has changed. It's an important transitional phase where they move from egocentric thinking typical of the previous stage to more logical, operational thought processes that are less dependent on direct experience.

The other stages mentioned involve different cognitive capacities: the preoperational stage is characterized by symbolic thinking but lacks logical operations, the formal operational stage marks the development of abstract thinking, and the sensorimotor stage pertains to the initial cognitive development in infants.