AP Psychology Cognition — Worked Answer Explanations

Unit 2 · 24 questions explained

Below is a complete answer key for our AP Psychology Cognition practice questions. For each question you'll find the correct choice, a full written explanation of how to get there, and — for every wrong answer — a short note on exactly why it's tempting and where it goes wrong. Reading these straight through is one of the fastest ways to find the gaps in a unit before exam day.

Prefer to test yourself first? Take the timed Cognition practice test and come back here to review, or head back to the Cognition unit overview.

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Question 1 · Easy
In the Atkinson-Shiffrin model of memory, which store holds sensory information for only a fraction of a second before it either fades or is passed to short-term memory?
- A
  Short-term memory
  Why not A: Short-term memory holds information for about 20–30 seconds through rehearsal; it is the second stage, not the first.
- B
  Long-term memory
  Why not B: Long-term memory is the final, relatively permanent storage stage, not the initial sensory buffer.
- C
  Working memory
  Why not C: Working memory (Baddeley's model) is an elaboration of short-term memory emphasizing active processing, not the brief sensory buffer.
- D
  Sensory memoryCorrect
Explanation
In the Atkinson-Shiffrin (multi-store) model, sensory memory is the first stage. It holds large amounts of raw sensory input for a very brief time — iconic (visual) memory lasts about 0.5 seconds; echoic (auditory) memory lasts 3–4 seconds. Only information that is attended to moves into short-term memory. This was demonstrated by Sperling's partial-report experiments with iconic memory.

Key takeaway
Sensory memory is the brief, high-capacity first stage that holds raw sensory input for fractions of a second.
Question 2 · Easy
George Miller's classic research on short-term memory capacity concluded that people can hold approximately how many chunks of information at one time?
- A
  3 ± 1 items
  Why not A: More recent research (Cowan, 2001) suggests 4 ± 1, but Miller's original famous finding was a higher number.
- B
  7 ± 2 itemsCorrect
- C
  12 ± 3 items
  Why not C: This substantially exceeds the documented short-term memory limit; long-term memory is needed for that many items.
- D
  20 ± 5 items
  Why not D: Far beyond the documented STM capacity; confuses long-term and short-term memory limits.
Explanation
Miller (1956) published 'The Magical Number Seven, Plus or Minus Two,' establishing that short-term memory holds about 7 (±2) chunks. A chunk is a meaningful unit of information — grouping individual digits into meaningful patterns (area codes, dates) allows more information to fit within this limit. More recent work by Cowan suggests the limit may be closer to 4, but Miller's 7 ± 2 is the AP exam standard.

Key takeaway
Short-term memory holds about 7 ± 2 chunks of information (Miller's magic number).
Question 3 · Easy
Knowing how to ride a bicycle without consciously thinking about each movement is BEST classified as which type of long-term memory?
- A
  Procedural memoryCorrect
- B
  Episodic memory
  Why not B: Episodic memory stores autobiographical events tied to specific times and places (e.g., your first bike ride), not the motor skill of riding itself.
- C
  Semantic memory
  Why not C: Semantic memory stores general factual knowledge and meanings, not motor skills. Knowing that bicycles have two wheels is semantic; knowing how to ride one is procedural.
- D
  Working memory
  Why not D: Working memory is a short-term, capacity-limited system for active processing, not long-term storage of skills.
Explanation
Procedural memory is a type of implicit (non-declarative) long-term memory that stores motor skills and conditioned responses. Once consolidated, procedural memories are accessed without conscious effort — you don't "recall" how to ride a bike, you just do it. This is contrasted with explicit (declarative) memory, which is divided into episodic (personal events) and semantic (general knowledge). Patients with amnesia who lose explicit memory often retain procedural memory.

Key takeaway
Procedural memory holds learned motor skills accessed automatically without conscious recall.
Question 4 · Easy
In language, phonemes are BEST described as:
- A
  The smallest units of meaningful sound (e.g., the /b/ in "bat").Correct
- B
  The smallest units of meaning (e.g., the prefix "un-" in "undo").
  Why not B: Smallest units of MEANING are morphemes, not phonemes. A prefix like "un-" carries meaning; phonemes are sounds that may not carry meaning by themselves.
- C
  The rules for combining words into grammatical sentences.
  Why not C: Rules for combining words into sentences is SYNTAX, not phonemes.
- D
  The implied meaning of a sentence based on context.
  Why not D: Context-based implied meaning is PRAGMATICS, the highest level of linguistic analysis, not phonemes.
Explanation
Linguistic units form a hierarchy: phonemes (sounds) → morphemes (meanings) → syntax (sentence structure) → semantics (literal meaning) → pragmatics (contextual/implied meaning). English has about 44 phonemes. The /b/ in "bat" is a phoneme — it has no meaning by itself, but distinguishes "bat" from "cat" or "pat." Morphemes are the smallest meaning-carrying units ("cat" itself, or affixes like "-ed," "un-").

Key takeaway
Phonemes are the smallest sound units; morphemes are the smallest meaning units.
Question 5 · Easy
After studying Spanish for two years, Elena now has difficulty remembering the French she learned in high school. This forgetting is best explained by:
- A
  Proactive interference
  Why not A: Proactive interference is when OLD learning disrupts recall of NEW material — the opposite of what is described here.
- B
  Retroactive interferenceCorrect
- C
  Decay theory
  Why not C: Decay theory attributes forgetting to the passive fading of memory traces over time, not to active interference from new learning.
- D
  Encoding failure
  Why not D: Encoding failure means the information was never properly stored to begin with; Elena did learn French, so encoding is not the issue.
Explanation
Retroactive interference occurs when newly acquired information disrupts recall of previously learned material. Elena's newer Spanish learning interferes backward in time with her existing French memories. Proactive interference runs in the opposite direction — old learning disrupts new. Both are forms of interference-based forgetting, distinct from decay (passive fading) or retrieval failure.

Key takeaway
Retroactive interference: new learning disrupts recall of old material (backward in time).
Question 6 · Easy
According to Noam Chomsky's theory of language acquisition, children develop language so rapidly and uniformly across cultures because humans have an innate:
- A
  Critical period that reinforces correct grammar
  Why not A: Critical periods exist, but Chomsky's key theoretical contribution is the innate biological mechanism, not external reinforcement.
- B
  Language acquisition device (LAD)Correct
- C
  Zone of proximal development for language
  Why not C: The zone of proximal development is Vygotsky's concept about the gap between what a child can do alone versus with guidance — not Chomsky's linguistic theory.
- D
  Operant conditioning mechanism that shapes speech
  Why not D: Skinner argued language is shaped by reinforcement (operant conditioning), but Chomsky refuted this, arguing no amount of reinforcement explains children's spontaneous grammatical sentences they have never heard.
Explanation
Chomsky proposed the language acquisition device (LAD) — a hypothetical innate biological mechanism that enables children to rapidly infer grammatical rules from the language they hear. Evidence: children across all cultures pass through similar stages, make rule-based errors (overgeneralization: 'goed,' 'mouses'), and acquire language far too quickly given the impoverished input available (the poverty of the stimulus argument). This was a direct rebuttal to Skinner's behaviorist account.

Key takeaway
Chomsky's LAD: humans are biologically pre-wired to acquire language grammar quickly and universally.
Question 7 · Easy
What is the KEY difference between an algorithm and a heuristic in problem-solving?
- A
  Algorithms guarantee a correct solution but may be slow; heuristics are mental shortcuts that are faster but may produce errors.Correct
- B
  Algorithms only work on numerical problems; heuristics work on language problems.
  Why not B: Both algorithms and heuristics apply across domains — numerical, language, social, perceptual, etc. The distinction is about correctness vs. speed, not problem type.
- C
  Heuristics are learned through formal education; algorithms develop naturally.
  Why not C: Heuristics often develop intuitively without formal instruction (in fact, many are unconscious); algorithms are usually explicitly learned.
- D
  Algorithms always require a computer; heuristics are used only by humans.
  Why not D: Humans regularly use algorithms (e.g., long division), and computers use heuristics (e.g., in search and AI). The terms describe problem-solving strategies, not who or what uses them.
Explanation
An algorithm is a systematic step-by-step procedure that, if followed correctly, guarantees a solution (e.g., trying every possible letter combination to unscramble a word). A heuristic is a mental shortcut — "the gist of it" — that's faster but doesn't guarantee correctness (e.g., starting with vowels in word puzzles). Heuristics underlie many cognitive biases studied by Tversky and Kahneman.

Key takeaway
Algorithms guarantee correctness through systematic steps; heuristics are fast shortcuts that trade certainty for speed.
Question 8 · Easy
A teacher reads a list of 20 words aloud and asks students to recall as many as possible. Most students remember the FIRST few words better than the middle ones. This is BEST explained by the:
- A
  Recency effect
  Why not A: The recency effect is enhanced recall for items at the END of the list (still in short-term memory). The question asks about the FIRST few words.
- B
  Primacy effectCorrect
- C
  Spacing effect
  Why not C: The spacing effect refers to better long-term retention when learning is spread over time vs. crammed. It's about study schedule, not position within one list.
- D
  Encoding specificity
  Why not D: Encoding specificity says retrieval is better when cues match the original encoding context. It doesn't predict position-based recall differences.
Explanation
The serial position effect predicts a U-shaped recall curve: items at the beginning (primacy) and end (recency) are remembered better than those in the middle. The primacy effect is attributed to rehearsal — early items get rehearsed more and transfer to long-term memory. The recency effect comes from items still being in short-term memory at recall. The middle items get the least of both advantages.

Key takeaway
Primacy effect: better recall for items at the start of a list, due to extra rehearsal into long-term memory.
Question 9 · Medium
A chess grandmaster can glance at a mid-game board for five seconds and reconstruct piece positions far better than a novice can. This difference is best explained by the grandmaster's superior use of:
- A
  Fluid intelligence
  Why not A: Fluid intelligence is general problem-solving ability; it does not specifically account for expertise-based memory advantages in a domain.
- B
  Chunking based on long-term memory schemasCorrect
- C
  Larger sensory memory capacity
  Why not C: Sensory memory capacity does not differ between novices and experts; the difference lies in how information is organized in long-term memory.
- D
  Higher working memory span
  Why not D: Chase and Simon's research showed that grandmasters did NOT differ from novices on random piece positions — only on meaningful game configurations, pointing to chunking, not raw capacity.
Explanation
Chase and Simon (1973) showed that chess grandmasters recall meaningful board positions far better than novices, but perform similarly on randomly arranged pieces. This demonstrates that expertise creates rich long-term memory schemas (chunks) — grandmasters recognize configurations as meaningful units rather than individual pieces. This links chunking to expert performance and illustrates that memory limitations can be worked around with organized long-term knowledge.

Key takeaway
Expertise improves memory through chunking: domain-specific long-term memory schemas allow more information to be processed as single units.
Question 10 · Medium
When solving a problem, someone always tries the same solution strategy that worked in the past, even when a novel approach would be more efficient. This tendency is called:
- A
  Functional fixedness
  Why not A: Functional fixedness is the inability to see an object used for a new purpose (e.g., using a coin as a screwdriver), not repetitive strategy use.
- B
  Confirmation bias
  Why not B: Confirmation bias is the tendency to seek information that confirms pre-existing beliefs, not the perseveration of problem-solving strategies.
- C
  Mental setCorrect
- D
  Availability heuristic
  Why not D: The availability heuristic is estimating probability by how easily examples come to mind (e.g., overestimating plane crash risk after news coverage), not a problem-solving barrier.
Explanation
Mental set is the tendency to approach problems using previously successful strategies, even when those methods are no longer optimal. It is a form of cognitive rigidity. Luchins' water jar experiments demonstrated mental set: participants who solved a series of problems with a complex formula continued using it even when a much simpler solution was available. Mental set is an obstacle to creative problem-solving.

Key takeaway
Mental set: relying on previously successful strategies blocks recognition of simpler or more effective solutions.
Question 11 · Medium
Baddeley and Hitch proposed that working memory includes a phonological loop, a visuospatial sketchpad, and a central executive. Which component is primarily responsible for coordinating and directing attention between the other components?
- A
  Phonological loop
  Why not A: The phonological loop stores and rehearses verbal and auditory information (inner voice/ear); it does not direct attention or coordinate other components.
- B
  Visuospatial sketchpad
  Why not B: The visuospatial sketchpad temporarily holds visual and spatial information; it is a storage subsystem, not an executive coordinator.
- C
  Episodic buffer
  Why not C: The episodic buffer (added later by Baddeley) links working memory to long-term memory and integrates information across codes, but is not the primary attentional controller.
- D
  Central executiveCorrect
Explanation
In Baddeley's working memory model, the central executive is the supervisory attentional system. It directs attention, coordinates the slave systems (phonological loop and visuospatial sketchpad), switches focus between tasks, and retrieves information from long-term memory. Impairment of the central executive is associated with dysexecutive syndrome seen in frontal lobe damage.

Key takeaway
The central executive directs attention and coordinates the subsystems of working memory.
Question 12 · Medium
During a clinical interview, a patient consistently interprets ambiguous facial expressions as hostile. According to Aaron Beck's cognitive theory, this error in thinking is an example of:
- A
  Repression
  Why not A: Repression is a Freudian defense mechanism — unconsciously blocking threatening memories from awareness. Beck's theory is cognitive, not psychodynamic.
- B
  A cognitive distortion (arbitrary inference / mind reading)Correct
- C
  Operant extinction
  Why not C: Operant extinction is the decrease in a behavior when reinforcement is removed — a behavioral concept unrelated to interpretive thinking errors.
- D
  Latent content processing
  Why not D: Latent content refers to the hidden meaning of dreams in Freudian theory, not to conscious interpretive errors.
Explanation
Aaron Beck identified systematic cognitive distortions — biased thinking patterns that maintain negative emotions. Interpreting ambiguous stimuli as hostile is an example of arbitrary inference (drawing negative conclusions without sufficient evidence) or mind reading (assuming hostile intent in others). Beck argued these distortions stem from negative automatic thoughts rooted in dysfunctional schemas. Cognitive Behavioral Therapy (CBT) targets these distortions directly.

Key takeaway
Beck's cognitive distortions are systematic biased thinking patterns (e.g., mind reading, arbitrary inference) that perpetuate emotional disorders.
Question 13 · Medium
Sometimes when trying to remember a word, you feel as if it's "on the tip of your tongue" — you know related information about it but can't produce the word itself. This phenomenon BEST illustrates:
- A
  A failure of encoding — the word was never properly stored.
  Why not A: If the word were never encoded, you wouldn't know any related information about it. Tip-of-the-tongue states involve partial access, which proves encoding occurred.
- B
  A retrieval failure — the memory exists but cannot be currently accessed.Correct
- C
  Storage decay — the memory trace has weakened over time.
  Why not C: Decay would manifest as loss of related information too, not just the target word. The hallmark of TOT is INTACT related knowledge with blocked access to one specific item.
- D
  Source amnesia — confusion about where information was learned.
  Why not D: Source amnesia is forgetting WHERE you learned something while recalling the content. TOT is the opposite — you can't recall the content itself.
Explanation
The tip-of-the-tongue (TOT) phenomenon is a classic demonstration that retrieval is a distinct memory process from encoding and storage. The information is clearly stored (you can describe the word's meaning, first letter, or syllable count), but a momentary block prevents access. Retrieval often succeeds later, sometimes when you stop trying. TOT challenges the misconception that "forgetting" always means information loss.

Key takeaway
Tip-of-the-tongue is retrieval failure: the memory is stored but momentarily inaccessible.
Question 14 · Medium
A used-car salesperson lists a vehicle at $25, 000, k n o w in g c u s t o m er s w i l l n e g o t ia t e d o w n . C u s t o m er s w h oco u n t er - o f f er t y p i c a l l y se ttl e a r o u n d$ 22,000 — much higher than they would have if no price had been listed. This pattern BEST illustrates:
- A
  The availability heuristic
  Why not A: The availability heuristic is judging probability by how easily examples come to mind (e.g., overestimating plane crash risk after media coverage). The car-price scenario is about a numerical reference point, not vivid examples.
- B
  AnchoringCorrect
- C
  Confirmation bias
  Why not C: Confirmation bias is seeking information that supports existing beliefs. Anchoring is a different bias — adjusting estimates from a starting reference point.
- D
  The framing effect
  Why not D: Framing effects involve different responses to the same information presented in positive vs. negative wording (e.g., "90% survive" vs "10% die"). The car scenario shows numerical anchoring, not wording effects.
Explanation
Anchoring is a cognitive bias where an initial reference value disproportionately influences subsequent estimates. Once $25,000 is on the table, all counter-offers gravitate toward it, even though the anchor may be arbitrary or strategically inflated. Tversky and Kahneman demonstrated this with classic experiments (e.g., spinning a wheel and then asking participants to estimate the percent of African countries in the UN — higher spin values led to higher estimates). Anchoring is widely exploited in sales, negotiation, and pricing.

Key takeaway
Anchoring: an initial reference value biases subsequent numerical judgments.
Question 15 · Medium
Asked to guess whether someone is a librarian or a salesperson based on the description "quiet, organized, enjoys reading," most people choose librarian — even when told salespeople outnumber librarians 75 to 1 in the population. This demonstrates:
- A
  The representativeness heuristic, with neglect of base ratesCorrect
- B
  The availability heuristic
  Why not B: Availability is judging by how easily examples come to mind. This scenario is about matching a description to a category prototype while ignoring statistical likelihood — that's representativeness.
- C
  Belief perseverance
  Why not C: Belief perseverance is clinging to a belief even after the evidence supporting it is discredited. The scenario doesn't involve revising or maintaining a prior belief — it's a probability judgment.
- D
  Functional fixedness
  Why not D: Functional fixedness is failing to see an object used for an alternative purpose. Unrelated to category-membership judgments.
Explanation
The representativeness heuristic judges category membership by how well an example matches a stereotypical prototype, ignoring base rates (the actual frequency of categories in the population). Here, the description matches the librarian prototype better than the salesperson prototype — so people choose librarian despite salespeople being 75× more common. Bayesian reasoning would weight base rates heavily; the representativeness heuristic systematically underweights them, leading to predictable errors.

Key takeaway
Representativeness heuristic: judging by prototype match while neglecting base rates (actual category frequencies).
Question 16 · Medium
According to Craik and Lockhart's levels of processing framework, which of the following encoding strategies should produce the BEST long-term retention of a list of new vocabulary words?
- A
  Repeatedly saying each word out loud
  Why not A: Repetition is shallow (phonological/acoustic) processing — better than visual but inferior to semantic encoding for long-term retention.
- B
  Underlining each word in bold font
  Why not B: Bold formatting affects visual appearance (the shallowest level). Pure visual features produce the weakest long-term retention.
- C
  Composing a sentence using each word in a personally meaningful contextCorrect
- D
  Counting the letters in each word
  Why not D: Letter-counting is structural/visual processing — shallow. It produces weaker memory than semantic engagement with the word's meaning.
Explanation
The levels of processing theory holds that the deeper (more semantic) the engagement with material at encoding, the better the long-term retention. Three levels (shallowest to deepest): structural/visual ("is it capitalized?"), phonological/acoustic ("does it rhyme with...?"), and semantic ("does it fit this sentence?" or "what does it mean?"). Generating personally meaningful sentences forces semantic processing AND ties the word to existing knowledge, both of which boost retention beyond rote rehearsal.

Key takeaway
Levels of processing: deeper/semantic encoding produces stronger long-term memory than shallow visual or phonological processing.
Question 17 · Medium
Maria can vividly recall the day she received her college acceptance letter — where she was, what she was wearing, who she told first. She also knows that the capital of France is Paris, though she can't remember when or where she learned that fact. Maria's recollection of the acceptance day is BEST described as ____ memory; her knowledge that Paris is the capital is ____ memory.
- A
  semantic; episodic
  Why not A: This reverses the distinction. Personal autobiographical events tied to time and place are episodic; general decontextualized facts are semantic.
- B
  episodic; semanticCorrect
- C
  implicit; explicit
  Why not C: Both examples are EXPLICIT (declarative) — Maria can consciously describe both. Implicit memory is unconscious (e.g., procedural skills, conditioning). The distinction asked is within explicit memory: episodic vs. semantic.
- D
  procedural; declarative
  Why not D: Neither example is procedural (motor skills); both are declarative. The relevant subdivision is within declarative memory: episodic for events, semantic for facts.
Explanation
Tulving's distinction within explicit (declarative) long-term memory: episodic memory stores personally experienced events tagged with time, place, and surrounding context — Maria's acceptance-day memory. Semantic memory stores decontextualized general knowledge — facts, concepts, vocabulary — without the personal experience of when it was learned. Both are conscious and accessible; both can be lost selectively in different forms of amnesia.

Key takeaway
Episodic memory: personal experienced events; semantic memory: general decontextualized facts.
Question 18 · Hard
Spearman proposed that intelligence can be described as a single general factor (g) underlying all mental abilities. Gardner challenged this view by proposing that humans have multiple distinct intelligences. Which of the following correctly distinguishes these two positions?
- A
  Spearman focused on cultural differences in intelligence; Gardner focused on a common biological factor.
  Why not A: This reverses both theorists' positions; Spearman proposed the common biological g factor, and Gardner emphasized diverse types.
- B
  Spearman argued for a single underlying cognitive capacity; Gardner argued that intelligences like musical ability and bodily-kinesthetic skill are independent of g.Correct
- C
  Both theorists agree that traditional IQ tests fully capture human intelligence.
  Why not C: Gardner explicitly criticized narrow IQ tests, arguing they miss most of his eight intelligences. Spearman supported psychometric testing.
- D
  Gardner's theory has stronger empirical support from factor-analytic studies than Spearman's g.
  Why not D: Factor-analytic evidence has generally supported g more strongly than Gardner's model; critics note Gardner's intelligences lack independent predictive validity in the literature.
Explanation
Spearman used factor analysis to identify g (general intelligence), a single capacity that correlates with performance across diverse cognitive tasks. Gardner's theory of multiple intelligences (linguistic, logical-mathematical, musical, spatial, bodily-kinesthetic, interpersonal, intrapersonal, naturalist) challenges the unitary view by claiming these are biologically distinct and can be selectively impaired or preserved (e.g., a savant with extraordinary musical ability but intellectual disability). The debate concerns whether intelligence is one thing or many things.

Key takeaway
Spearman: g = one general factor; Gardner: multiple independent intelligences beyond traditional cognitive measures.
Question 19 · Hard
Elizabeth Loftus's research on eyewitness testimony demonstrated that memory is reconstructive rather than reproductive. Which experimental finding most directly supports this conclusion?
- A
  Participants remembered more words from a list when tested immediately rather than one week later.
  Why not A: Faster forgetting over time supports decay or interference theories, not the reconstructive nature of memory specifically.
- B
  Participants who were asked 'How fast was the car going when it smashed?' estimated higher speeds than those asked about 'contact.'Correct
- C
  Participants recalled words from the beginning and end of a list better than from the middle.
  Why not C: This is the serial position effect (primacy and recency), which relates to how information is encoded, not to post-encoding distortion.
- D
  Participants given a mnemonic strategy recalled 40% more items than a control group.
  Why not D: This shows that encoding strategies improve retrieval, not that existing memories can be distorted by later information.
Explanation
Loftus and Palmer (1974) showed participants a film of a car accident and varied the verb used in the question ('smashed,' 'hit,' 'contacted'). The misleading post-event information (the harsher verb) altered participants' speed estimates and, in follow-up studies, led them to 'remember' broken glass that was not in the film. This misinformation effect demonstrates that memory is actively reconstructed each time it is retrieved, not played back like a video recording.

Key takeaway
Loftus's misinformation effect: leading questions can alter memory, showing memory is reconstructive, not reproductive.
Question 20 · Hard
A cognitive psychologist studies how people decide whether an object belongs to a category. Participants judge a robin as a 'bird' faster than they judge a penguin as a 'bird.' This finding is best explained by:
- A
  The availability heuristic
  Why not A: The availability heuristic estimates frequency based on how easily examples come to mind; it does not explain prototype-based categorization speed.
- B
  Rosch's prototype theoryCorrect
- C
  The representativeness heuristic
  Why not C: The representativeness heuristic is used for probability judgments about whether something belongs to a category based on resemblance to a stereotype, not specifically about categorization response time.
- D
  Sternberg's triarchic theory of intelligence
  Why not D: Sternberg's theory addresses analytical, creative, and practical intelligences — it does not explain semantic categorization speed.
Explanation
Eleanor Rosch's prototype theory proposes that we mentally organize categories around prototypes — the most typical, central members. A robin is a highly prototypical bird (flies, has feathers, sings), so it is classified rapidly. A penguin shares fewer features with the prototype (cannot fly, lives in Antarctic), so categorization is slower and less certain. Prototypes serve as mental reference points for concept membership.

Key takeaway
Prototype theory: typical category members (prototypes) are classified faster than atypical members.
Question 21 · Hard
A researcher hypothesizes that a particular vitamin improves memory. To test this, they survey people who already take the vitamin and ask, "Has your memory improved since starting?" Most report yes. Why is this study design vulnerable to confirmation bias even before considering placebo effects?
- A
  The researcher selectively asks a question that frames "yes" as the expected and easily-recalled answer, and likely interprets ambiguous responses as supporting the hypothesis.Correct
- B
  Confirmation bias only applies to qualitative research, not surveys.
  Why not B: Confirmation bias affects research of all kinds, including survey design, data interpretation, and conclusion-drawing. It's not limited to qualitative work.
- C
  The researcher used too small a sample size.
  Why not C: Sample size affects statistical power and generalizability, but it's a separate issue from confirmation bias. A large biased study is still biased.
- D
  Confirmation bias only happens with double-blind designs.
  Why not D: This is backwards — double-blind designs REDUCE confirmation bias by hiding condition information from researchers. Single-blind or open designs (like this survey) are MORE vulnerable.
Explanation
Confirmation bias is the tendency to seek, interpret, and remember information in ways that support pre-existing beliefs. The question wording ("Has your memory improved?") prompts recall of positive instances and downplays counterexamples. A researcher expecting improvement may also interpret ambiguous answers ("maybe") generously and remember confirming responses more vividly. Good research design counteracts this with: random assignment to conditions, neutral wording ("Has your memory changed?"), double-blind procedures, and pre-registered hypotheses.

Key takeaway
Confirmation bias affects every stage of inquiry — question wording, data collection, and interpretation — when researchers expect a particular outcome.
Question 22 · Hard
A locksmith eventually figures out a complex puzzle after a long period of being stuck. The moment the solution appears, it seems sudden and complete — not the result of incremental trial-and-error. This BEST illustrates:
- A
  Insight problem-solvingCorrect
- B
  Trial-and-error problem-solving
  Why not B: Trial-and-error involves systematically (or unsystematically) testing many candidate solutions. The hallmark of this scenario is a SUDDEN, COMPLETE solution after a period of stuckness — not incremental testing.
- C
  Functional fixedness
  Why not C: Functional fixedness is the inability to see objects used unconventionally. The scenario describes solving the puzzle, not being blocked by fixed assumptions about an object's use.
- D
  Confirmation bias
  Why not D: Confirmation bias is about belief preservation, not the sudden "aha" experience of cracking a puzzle.
Explanation
Insight problem-solving is characterized by a sudden, complete realization of the solution after a period of being stuck — the "aha moment" famously studied by Köhler in chimpanzees stacking boxes to reach bananas. Brain imaging shows distinct neural signatures (a burst of right anterior temporal lobe activity) before insight solutions, compared to the more gradual prefrontal activity of analytic problem-solving. Insight contrasts with trial-and-error (test many options) and algorithmic stepping-through.

Key takeaway
Insight: sudden, complete solution after a period of being stuck — the "aha" experience.
Question 23 · Hard
A student studies a chapter in sections, pausing to quiz herself after each section rather than re-reading it. Research on memory encoding predicts that the self-quizzing method will produce better long-term retention because it relies primarily on:
- A
  The spacing effect
  Why not A: The spacing effect refers to distributing study sessions over time rather than massing them; this scenario is about retrieval practice, not spacing.
- B
  The testing effect (retrieval practice)Correct
- C
  Elaborative rehearsal through semantic encoding
  Why not C: Elaborative rehearsal involves connecting information to existing knowledge for deeper encoding — quizzing does involve retrieval but is specifically captured by the testing effect label.
- D
  Priming through repeated exposure
  Why not D: Priming is the activation of one concept that makes a related concept more accessible — re-reading, not quizzing, would better fit a priming explanation.
Explanation
The testing effect (also called retrieval practice effect) is the robust finding that actively retrieving information from memory produces stronger long-term retention than passive re-study. When the student quizzes herself, each retrieval attempt strengthens the memory trace and identifies gaps. Roediger and Karpicke's research showed that a test-study-test condition outperformed study-study-study on a delayed final test, even though students predicted the opposite. This is one of the most practically important findings in cognitive psychology.

Key takeaway
Testing effect: actively retrieving information produces stronger long-term memory than re-reading or passive review.
Question 24 · Hard
Benjamin Whorf's linguistic relativity hypothesis proposed that:
- A
  The language we speak shapes the way we perceive and think about the world.Correct
- B
  All humans share an innate universal grammar regardless of language.
  Why not B: This describes Chomsky's universal grammar — essentially the OPPOSITE of Whorf's view. Whorf emphasized that languages differ in ways that matter for thought; Chomsky emphasized deep shared structure.
- C
  Language acquisition occurs only during a critical period in early childhood.
  Why not C: Critical period hypothesis is a different proposal (associated with Lenneberg). It's about WHEN language can be acquired, not whether language shapes thought.
- D
  Bilingual speakers always think in their first language even when speaking the second.
  Why not D: This is not a claim of linguistic relativity. Modern research suggests bilingual people often think in whichever language is dominant for that context, and this varies.
Explanation
Whorf (and Sapir) argued that the structure of one's native language influences cognition — that speakers of languages with different color terms, spatial frames of reference, or grammatical features actually perceive and remember the world differently. The strong version ("language determines thought") is now mostly rejected, but a weaker version ("language influences thought") has experimental support (e.g., Russian speakers, who have separate words for light blue and dark blue, discriminate those shades faster than English speakers). The debate continues, particularly around spatial cognition and number perception.

Key takeaway
Linguistic relativity (Whorf): language shapes perception and thought; modern evidence supports a weak version of this claim.