Key Milestones in Piaget’s Sensory-Motor Stage of Development


  1. What is the sensory-motor stage?

    • The first stage in Piaget’s theory of cognitive development, from birth to 2 years.
  2. What is the primary focus during this stage?

    • Development of sensory and motor skills.
  3. At what age does the sensory-motor stage occur?

    • From birth to 2 years.
  4. What is object permanence?

    • The understanding that objects continue to exist even when they are out of sight.
  5. When does object permanence develop?

    • Around 8-12 months.
  6. What is meant by “reflexive behaviors” in this stage?

    • Reflexes such as sucking, grasping, and looking.
  7. What role do sensory experiences play?

    • Infants learn through seeing, hearing, touching, and moving.
  8. What is the significance of motor skills in this stage?

    • Motor skills help infants explore and interact with their environment.
  9. How do infants learn during this stage?

    • Through sensory exploration and physical actions.
  10. What is the “A-not-B error”?

  • A common mistake where infants search for an object in the first hiding place rather than the second.




  1. When do infants show the A-not-B error?
  • Typically between 8-12 months.
  1. What is the importance of imitation?
  • Infants begin imitating actions and behaviors they observe.
  1. When do infants start imitating actions?
  • Around 6-9 months.
  1. What is the role of cause and effect in this stage?
  • Infants begin to understand that actions have consequences.
  1. How do infants understand causality?
  • By exploring their environment and seeing the effects of their actions.
  1. What is symbolic thought?
  • The ability to represent objects or actions mentally, which begins towards the end of the sensory-motor stage.
  1. When does symbolic thought emerge?
  • Around 18-24 months.
  1. What is deferred imitation?
  • Imitating actions or behaviors after a delay.
  1. When does deferred imitation develop?
  • Around 18 months.
  1. What is the significance of the sensory-motor stage?
  • It lays the foundation for later cognitive development and learning.

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