AP Psychology · Unit 3 · Test prep

Unit 3 Practice Test

Sensation & Perception: practice questions in the style of Friday's test, plus a walk-through of the Article Analysis Question

  • 35 practice questionsEach one explains its answer
  • 14 quick sortsThe pairs students mix up most
  • AAQ walk-throughPractice study + scoring guides
  1. Answer before you look at the choices. Name the concept first, then find it.
  2. Read every explanation, including on the ones you get right.
  3. Write the AAQ parts in full before you open their scoring guides. Then download your PDF or email it to yourself.
0 answered
Part 1Sensation

Every question is a scenario, just like Friday. Decide what concept the situation shows before you look at the choices, then find it. Your first pick counts, and the explanation appears right away.

1.When light reaches Maya's retina, her rods and cones convert it into neural impulses that travel along the optic nerve. This conversion is called

2.In a dark bedroom, switching on one small lamp makes a big difference. In a sunny classroom, the same lamp is barely noticeable. Which principle best explains this?

3.After reading about a tumor another doctor missed, a radiologist starts flagging more scans as possibly abnormal. She catches more real tumors but also flags more healthy scans. Which concept best explains the change?

4.Jordan puts on a watch in the morning. By lunch he no longer feels it on his wrist, even though it has not moved. Which of the following best explains this?

5.Stargazing, Nia notices that a faint star looks brighter when she looks slightly to the side of it rather than straight at it. Why?

6.Although people can see reddish-yellow (orange) and bluish-green (teal), nobody reports seeing a color that is both reddish and greenish at once. Which theory best explains this?

7.Recording from one neuron in a cat's visual cortex, researchers find it fires only when a bar of light tilted at 45 degrees crosses the screen. This neuron is best described as a

8.After damage to her visual cortex, Ms. Hale says she sees nothing on her left side. Yet when asked to guess, she reaches accurately for objects placed there. This is most consistent with

9.A DJ turns the volume knob up without changing the song. Which property of the sound waves changes?

10.After a severe ear infection damages the tiny bones of his middle ear, Theo has trouble hearing, but a hearing aid helps a lot. Theo most likely has

11.With a bad cold, Rosa says her favorite curry "tastes like nothing." This best illustrates

12.A toddler bumps her elbow, and her dad rubs the spot, which seems to make it hurt less. Which theory best explains why rubbing helps?

13.When an elevator starts rising, Lucia feels a brief pull even with her eyes closed. Which sense detects this?

Part 2Perception
14.Ben can't make out one scrawled word in his friend's handwriting on its own. In the sentence "Meet me at the ____ after school to study," he reads it as "library" instantly. This best illustrates

15.Looking at an abstract painting she has never seen, an art student notes each line, color, and shape before she decides what it might show. She is relying mainly on

16.After a classmate claims a song's lyric is a silly misheard phrase, students who listen again can now only hear the misheard version. This best illustrates

17.Studying in a loud cafeteria, Kim follows her friend's story and tunes out the other conversations around her. This best illustrates

18.A researcher asks a stranger for directions. Two workers carrying a door walk between them, and behind the door the researcher swaps places with a different person. About half the strangers keep giving directions without noticing. This demonstrates

19.A teacher arranges 24 desks in clusters of four. From the doorway, visitors see six groups rather than 24 separate desks. Which Gestalt principle are they using?

20.In a photo of a straight railroad track, the two rails seem to meet at the horizon, which makes the scene look deep. Which depth cue is this?

21.As you bring a pencil toward your nose, you feel your eyes turning inward, and your brain uses that muscle feedback to judge how close the pencil is. Which depth cue is this?

22.On a hazy day, mountains on the horizon look blurry and faded, and hikers judge them to be farther away than they really are. Which depth cue are the hikers using?

23.As a door swings open, the image it casts on your retina changes from a rectangle to a narrow trapezoid, yet you still see a rectangular door. This best illustrates

24.A driver who has lost the sight in one eye can still judge depth well enough to drive safely. Which of the following best explains this?

Part 3Research and Data

About a quarter of the test asks you to read a study or a data table. Read the setup first, then the question.

Questions 25–27 refer to the following study.

Dr. Okafor wanted to know whether background noise changes how salty food tastes. She randomly assigned 40 volunteers to eat the same potato chips either in a quiet room or while hearing recorded airplane-cabin noise through headphones. Each participant then rated the chips' saltiness from 1 (not at all salty) to 9 (extremely salty).

ConditionnMean saltiness rating (1–9)
Quiet room206.4
Airplane noise204.1
25.What is the independent variable in Dr. Okafor's study?

26.Which is the operational definition of perceived saltiness in this study?

27.Which conclusion is best supported by the results?

Questions 28–29 refer to the following study.

A researcher surveyed 200 teenagers about how many hours per week they listen to earbuds at high volume and gave each one a hearing test (higher score = better hearing). She found a correlation of r = −0.45 between weekly earbud hours and hearing test score.

28.Which statement best describes the result?

29.Why can't the researcher conclude that loud earbud use causes hearing loss?

Questions 30–31 refer to the following data.

A student held a cotton ball soaked in vanilla extract under her nose and timed how many seconds passed before she could no longer notice the smell. She repeated the test on five different days.

Day12345
Seconds4238504644
30.What is the mean number of seconds before she stopped noticing the smell?

31.Which concept is this student measuring?

32.To compare reading speed in bright and dim light, a researcher flips a coin to decide which room each volunteer reads in. The coin flip is an example of

Part 4Commonly Confused Pairs

Most wrong answers come from mixing up two concepts that sound alike. Pick the one each scenario shows.

Inattentional blindness or change blindness?

  1. A driver checking her GPS never sees a cyclist roll into her lane.
    A driver checking her GPS never sees a cyclist roll into her lane.

  2. Nobody notices that the poster on the classroom wall was swapped for a different one over the weekend.
    Nobody notices that the poster on the classroom wall was swapped for a different one over the weekend.

  3. The audience watches a magician's raised hand and misses the coin he slips into his pocket.
    The audience watches a magician's raised hand and misses the coin he slips into his pocket.

Rods or cones?

  1. Spotting a deer moving at the edge of the road at night
    Spotting a deer moving at the edge of the road at night

  2. Reading the fine print on a medicine bottle under a bright lamp
    Reading the fine print on a medicine bottle under a bright lamp

  3. Telling a ripe yellow banana from a green one
    Telling a ripe yellow banana from a green one

Place theory or frequency theory?

  1. Hearing the highest notes of a piccolo
    Hearing the highest notes of a piccolo

  2. Hearing the low rumble of distant thunder
    Hearing the low rumble of distant thunder

Kinesthesis or vestibular sense?

  1. A dancer knows her arm is fully extended with her eyes closed.
    A dancer knows her arm is fully extended with her eyes closed.

  2. A figure skater keeps her balance coming out of a fast spin.
    A figure skater keeps her balance coming out of a fast spin.

Absolute threshold or difference threshold?

  1. Whether you can hear a phone buzz at all in a silent library
    Whether you can hear a phone buzz at all in a silent library

  2. Whether you can taste one extra sugar packet in your coffee
    Whether you can taste one extra sugar packet in your coffee

Random sampling or random assignment?

  1. Drawing names from a list of every senior in the district to take a survey
    Drawing names from a list of every senior in the district to take a survey

  2. Flipping a coin to decide which participants hear airplane noise
    Flipping a coin to decide which participants hear airplane noise

Part 5The FRQ: Article Analysis Question

What you'll be asked

The FRQ on Friday is an Article Analysis Question (AAQ). You read a short summary of a study (introduction, participants, method, results, discussion) and answer six labeled parts, always in this order, for 7 points:
A. Identify the research method.
B. State the operational definition of a variable.
C. Describe what a statistic or result means.
D. Identify an ethical guideline the researchers applied.
E. Explain how generalizable the findings are, using evidence from the study.
F. Explain how a finding supports or refutes the hypothesis (2 points: cite a specific result, then explain the connection).
Plan on about 25 minutes, with about 10 of them for reading.

Why it matters on the AP exam

The AP Psychology exam has two free-response questions, and the AAQ is one of them. The other is the Evidence-Based Question. Together they're a third of your exam score. The AAQ's six tasks never change, only the study does, so the skills you practice here carry over to every unit and to May. It's also the skill behind the research and data questions in the multiple choice.

How to attack it

1. Read the six prompts first, so you know what to hunt for.
2. Mark up the study as you read. Circle the conditions (the IV), box how things were measured (the operational definitions), underline who the participants were and how they were recruited, star the ethics words (consent, withdraw, debrief), and note the key numbers in the results.
3. Label every part (A–F) and write complete sentences.
4. Use the study in every answer. A definition alone earns nothing. Start with “In this study…”.
5. For C, say what the numbers mean: which group was higher, and whether the difference was statistically significant (unlikely to be due to chance) or not.
6. For E, take a position (limited, partly, or broadly generalizable) and name specific features of the sample or task (age, location, recruitment, the one task used) that limit who the results apply to. “Small sample” on its own doesn't earn the point.
7. For F, make two moves: quote a specific finding with its numbers, then explain how it connects to the hypothesis.

Practice study

Food Labels and Perceived Taste

A hypothetical study, written for practice and modeled on published research. It is not the study on Friday's test.

Introduction

Researchers tested the hypothesis that expectations created by a food label change how the food tastes.

Participants

Eighty high school students (ages 14–18; 44 girls and 36 boys) from two private high schools in one suburban county in Ohio responded to a flyer and received a $10 gift card. A parent of each student signed a consent form, and each student agreed to take part. Students with food allergies did not participate. Everyone was told they could stop at any time.

Method

Participants were randomly assigned to one of two conditions. Everyone tasted the same vanilla yogurt. In the premium condition, the cup was labeled “Gourmet small-batch organic vanilla yogurt.” In the basic condition, it was labeled “Store-brand vanilla yogurt.” Participants rated how pleasant the yogurt tasted on a scale from 1 (very unpleasant) to 9 (very pleasant). The researchers weighed each cup before and after a 5-minute tasting period to record the grams eaten. Afterward, every participant was told that the two yogurts were identical.

Results
ConditionMean pleasantness (1–9)Mean grams eaten
Premium label (n = 40)7.296
Basic label (n = 40)5.171

The difference in pleasantness ratings was statistically significant (p < .05). The difference in grams eaten was not (p = .21).

Discussion

The researchers concluded that the label changed how pleasant the yogurt tasted, but not reliably how much participants ate. They noted that only one food was tested and that they did not ask how hungry participants were.

Write each part in your own words before you open its scoring guide.

Check Part A against the scoring guide

Earns it: Experiment. Participants were randomly assigned to conditions, and the researchers manipulated the label (premium vs. basic).

Doesn't: “Correlational study,” “survey,” or “case study.”

Check Part B against the scoring guide

Earns it: Participants' rating of how pleasant the yogurt tasted, from 1 (very unpleasant) to 9 (very pleasant).

Doesn't: “How much they liked it,” with no mention of the 1–9 rating.

Check Part C against the scoring guide

Earns it: The premium group ate more on average, but because the difference was not statistically significant, it could be due to chance. The study can't conclude that the label changed how much people ate.

Doesn't: Restating “the premium group ate 25 more grams” without saying what that means, or ignoring that it wasn't significant.

Check Part D against the scoring guide

Earns it (any one, tied to the study): informed consent (parents signed consent forms and students agreed); right to withdraw (they could stop at any time); debriefing (they were told afterward that the yogurts were identical); protection from harm (students with allergies were excluded).

Doesn't: “The study was ethical,” or confidentiality, which the study never mentions. Deception is not a guideline; debriefing is what makes it acceptable.

Check Part E against the scoring guide

Earns it: Limited. Everyone was 14–18, from two private schools in one suburban Ohio county, recruited by flyer and paid. Only one food was tested. The results may not apply to adults, to students in public, urban, or rural schools, or to other foods.

Doesn't: “The sample was too small” on its own (80 isn't tiny, and size alone doesn't say who the results apply to), or any claim with no evidence from the study.

Check Part F against the scoring guide

Point 1, cite a finding: Premium-label participants rated the yogurt as more pleasant (7.2 vs. 5.1), and the difference was statistically significant.

Point 2, explain: The yogurt was identical, so only the expectation created by the label differed. That shows top-down processing changing perceived taste, which supports the hypothesis.

Also works: The grams-eaten difference was not significant, so that finding does not support the idea that labels change behavior, only how the food is perceived.

Doesn't: Citing the numbers with no explanation, or saying “it supports the hypothesis” with no finding.

Would it earn the point?

33.Which response to Part E would earn the point?

34.For Part F, a student wrote only: "The premium group rated the yogurt 7.2 and the basic group rated it 5.1." How many of the 2 points does this earn?

35.Which answer to Part A earns the point?

Save your results

Your PDF has your score, every question you missed on the first try with its answer and explanation, and your written AAQ answers, so it doubles as a study sheet for the test.