Questions: Memory Development: Capacity, Encoding, and Retrieval

Question 1

A 6-year-old is shown that silently repeating words over and over helps remember them. After the demonstration she uses the strategy successfully. When given a similar task later without any reminder, she doesn't rehearse at all. This pattern is best described as:

• A. Mediation-deficient — she cannot benefit from rehearsal even when shown how
• B. Production-deficient — she can use the strategy when prompted but won't deploy it spontaneously
• C. Strategy-competent — she clearly can use rehearsal effectively when reminded
• D. Showing infantile amnesia — her hippocampus is not yet mature enough for explicit recall

Answer: (B)

Production deficiency (typical of middle childhood) describes children who can benefit from encoding strategies when explicitly prompted but do not generate them on their own. A mediation-deficient child (younger, preschool) cannot benefit even when told what to do. This girl demonstrates the strategy works for her, placing her squarely in the production-deficient stage — she has the capability but lacks the metacognitive awareness to deploy it without external prompting. Strategy use becomes automatic only later, in late childhood.

Question 2

An 8-year-old chess prodigy and a chess-naive adult are both asked to memorize a list of chess piece positions. The child remembers significantly more positions. What best explains this?

• A. Children have larger working memory capacity than adults by age 8
• B. The child's extensive chess knowledge creates a rich encoding network, making each position more memorable through deeper integration
• C. Adults exhibit production deficiency for unfamiliar domains
• D. The child has superior hippocampal consolidation because developmental critical periods are still open

Answer: (B)

This is the classic prior knowledge effect: expertise doesn't just help at retrieval — it shapes how deeply new information is encoded in the first place. Each chess position the child sees connects to an existing rich network of patterns and schemas, enabling elaborative and organizational encoding that the naive adult cannot access. Raw working memory capacity (option A) actually favors the adult — adults average ~7±2 items vs. ~4–5 for school-age children. Prior knowledge compensates for and even surpasses the capacity advantage.

Question 3

Infants show recognition memory from the first weeks of life, but infantile amnesia persists because recognition and recall rely on different neural systems.

• T. True
• F. False

Answer: True

The Fagan test and preferential-looking paradigms demonstrate reliable recognition memory in very young infants — even newborns respond differently to familiar vs. novel stimuli. But recognition (detecting familiarity) and recall (retrieving an absent experience) rely on different neural circuitry. Infantile amnesia reflects the slow maturation of the hippocampal system and the absence of linguistic and narrative scaffolding needed to encode experiences as retrievable episodic memories. Recognition can survive without these structures; recall cannot.

Question 4

Working memory capacity expands across childhood primarily because children learn to rehearse information, not because of any underlying neurological development.

• T. True
• F. False

Answer: False

Both factors contribute, and it is incorrect to attribute capacity gains entirely to strategy acquisition. Neurological maturation — particularly of the hippocampus and prefrontal cortex — independently expands raw working memory capacity across childhood, from roughly 2 items at age 2–3 to 4–5 at school age to ~7 by adolescence. Rehearsal and other encoding strategies are layered on top of these structural changes, amplifying but not fully explaining the developmental gains.

Question 5

Why do older children typically outperform younger children on memory tasks even when both are given the same study time and the same material?

Model answer: Older children spontaneously deploy more effective encoding strategies — rehearsal, organizational grouping, elaboration — that younger children possess but don't generate without prompting. Additionally, older children's larger accumulated semantic knowledge creates richer encoding networks, allowing new material to be integrated more deeply with existing knowledge. Working memory capacity (which expands neurologically) and strategy use reinforce each other: better encoding builds richer knowledge stores, which in turn support more efficient future encoding.

The developmental arc involves three intertwined changes: growing working memory capacity, spontaneous strategy use, and accumulating domain knowledge. A younger child may learn the same strategy when shown, but won't recruit it unprompted. An older child's richer prior knowledge also means each new item has more 'hooks' to attach to, making it more memorable even before strategies are applied.