Piaget's Theory of Cognitive Development • Topic 2 of 6

Sensorimotor Stage (0–2 years)

From birth to about two years, the infant knows the world only through the senses and physical action — looking, grasping, sucking, banging — hence 'sensori-motor'. There is no internal symbolic thought yet. The landmark achievement of this stage is object permanence: the understanding that objects continue to exist even when they cannot be seen, heard or touched. A young infant who drops a toy out of sight acts as if it has vanished ('out of sight, out of mind'); by around 8 months the baby begins to search for the hidden object, and by the end of the stage object permanence is secure. The stage ends as the child starts to use mental symbols and deferred imitation (copying an action seen earlier), which opens the door to language and the next stage.

✅ Solved examples

1. An 8-month-old stops looking for a toy the moment it is hidden under a cloth. The concept she has not yet fully developed is:
Object permanence — understanding that objects continue to exist when out of sight. It is the key achievement of the sensorimotor stage.
2. The sensorimotor child understands the world mainly through:
Senses and motor actions (looking, grasping, mouthing, moving) rather than through symbols or language.
3. The ability to imitate an action hours or days after seeing it (a sign of emerging mental representation) is called:
Deferred imitation — it marks the transition from sensorimotor action to symbolic thought.

✏️ Practice — try these, take hints as needed

1. Object permanence is the major milestone of which stage?
The earliest stage.
Birth to ~2 years.
Sensorimotor stage
2. A baby thinks a toy 'disappears' when covered. This shows a lack of:
The stage’s key concept.
Out of sight, out of mind.
Object permanence
3. In the sensorimotor stage, a child learns primarily by:
Not by abstract thinking.
Through the body and senses.
Sensory experience and physical/motor action

📝 Topic test — 8 questions

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