How many stages of sleep are there in human beings?

Three-year-old Dominic calls his toy robot Sam and talks to him as if Sam is another 3-year-old. What explanation do researchers give for Dominic's behavior?

A) Dominic actually believes that the robot is alive. B) Dominic believes that all people and objects think the same thoughts that he thinks. C) Dominic cannot distinguish between animate and inanimate objects. D) Dominic has incomplete knowledge about certain objects, including his toy robot.

A problem is presented in the textbook that involves

connecting nine dots arranged in a square using four continuous lines drawn without lifting the pencil. Most people are initially unable to solve this problem because they assume incorrectly that they are not allowed to extend the lines beyond the square formed by the dots. This incorrect assumption illustrates how which of the following can be major barrier to creative thinking? a. incubation b. divergent thinking c. a prototype d. a mental set