Which of the following is a classic example of a sensitive period in development?

• A. Imprinting in birds
• B. A period with no effect
• C. A critical period for feeding behaviors
• D. Language exposure in early childhood

Answer: (D)

A sensitive period is a time when the brain is especially receptive to certain experiences, so exposure during that window has a strong impact on development, though learning can still occur later. Language exposure in early childhood is a classic example because young children’s language networks are highly plastic. Early immersion and interaction rapidly shape phonology, grammar, and vocabulary, making native-like language acquisition much more feasible. After this period, picking up a new language becomes more difficult, even if possible, which highlights the heightened responsiveness during early years.

Imprinting in birds is typically described as a critical period—a narrowly defined window where attachment forms and, if missed, cannot be easily redirected. A period with no effect isn’t relevant to sensitivity, and a critical period for feeding behaviors reflects a stricter, time-limited requirement rather than the more flexible responsiveness seen in language during early childhood.