PCS PCS Developmental Milestones and Neurodevelopment 2

Question 1

Object permanence, the understanding that objects continue to exist when out of sight, typically develops during which Piagetian stage?

Accepted Answer

Sensorimotor stage

Answer

Object permanence develops during the sensorimotor stage, typically around 8–12 months of age.

Question 2

Which primitive reflex should be fully integrated by 6 months and, if persistent, may interfere with rolling and crawling?

Accepted Answer

Asymmetrical tonic neck reflex (ATNR)

Answer

The ATNR should integrate by 4–6 months; persistence can inhibit midline crossing and bilateral coordination.

Question 3

A child who cannot stack 2 blocks by 15 months may be showing a delay in which developmental domain?

Accepted Answer

Fine motor

Answer

Stacking 2 blocks by 15 months is a fine motor milestone reflecting hand-eye coordination and pincer grasp development.

Question 4

Myelination of the central nervous system in children proceeds in which general direction?

Accepted Answer

Cephalic to caudal and proximal to distal

Answer

CNS myelination follows a cephalic-to-caudal and proximal-to-distal pattern, explaining the sequence of motor skill development.

Question 5

By what age should a typically developing child use at least 50 words and begin combining two words?

Accepted Answer

24 months

Answer

A vocabulary of 50+ words and two-word combinations (e.g., 'more milk') is expected by 24 months.

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