Two-month-old Sammy sucks his thumb between meals, which is an example of:
A) reflexes.
B) primary circular reactions.
C) secondary circular reactions.
D) coordination of secondary circular reactions.

Question

Quizplus · Accepted Answer

Thumb sucking in a two-month-old, like Sammy, is an example of primary circular reactions. This stage occurs from about 1 to 4 months of age and involves infants repeating pleasurable actions centered on their own body, such as sucking their thumb, which they discover by chance.

Two-Month-Old Sammy Sucks His Thumb Between Meals, Which Is an Example