AP Psychology: Explaining and Classifying Psychological Disorders (Drill 27)

Question 1. A clinician assesses a new client and determines that the client's pattern of thoughts, feelings, and behaviors causes significant distress, interferes with daily functioning at work and in relationships, and is not better explained by a cultural or religious practice. Which criterion framework is the clinician primarily applying?

• A) The biopsychosocial model of etiology
• B) The criteria used to classify behavior as disordered, including distress and dysfunction ✓
• C) The diathesis-stress model of disorder onset
• D) Rosenhan's critique of psychiatric diagnosis

Explanation: The clinician is applying the core criteria used in the DSM-5-TR framework to identify a disorder, roughly, distress, dysfunction, and deviance, with cultural context taken into account. (A) is the true-but-irrelevant distractor: the biopsychosocial model is a real and important framework, but it addresses what causes disorders (biological, psychological, and social contributors), not the criteria for deciding whether something qualifies as a disorder in the first place. (C) also addresses etiology, not diagnostic criteria. (D) refers to a famous critique about diagnostic validity, which is unrelated to the criteria the clinician is actively using here. [Practice 1]

Question 2. Two clinicians independently interview the same patient and then assign a DSM-5-TR diagnosis. They agree on the diagnosis. A researcher studying diagnostic practices is most directly measuring which property of the diagnostic system?

• A) Construct validity
• B) Internal consistency in the scenario described
• C) Inter-rater reliability ✓
• D) Predictive validity

Explanation: When two clinicians independently evaluate the same patient and reach the same diagnosis, what's being measured is agreement between raters, that is, inter-rater reliability. (A) asks whether the diagnostic category actually captures the construct it claims to measure, which is a different question. (B) refers to how consistently items within a single measure assess the same thing, not agreement between two clinicians. (D) is the true-but-irrelevant distractor: predictive validity (whether a diagnosis predicts future outcomes like treatment response) is genuinely important for evaluating a diagnostic system, but it is not what this specific scenario is testing. [Practice 2]

Question 3. A research team wants to test the diathesis-stress model as an explanation for the onset of a particular disorder. They follow 800 adolescents with varying levels of genetic risk (assessed from family history) over ten years and record both the life stressors each participant experiences and whether they develop the disorder. Which pattern of results would most directly support the diathesis-stress model?

• A) The disorder develops at the same rate regardless of genetic risk or stress level
• B) The disorder develops primarily in participants with high genetic risk, regardless of stress.
• C) The disorder develops most often in participants who have both high genetic risk and high exposure to life stressors. ✓
• D) The disorder develops most often in participants with high stress exposure, regardless of genetic risk as the example illustrates.

Explanation: The diathesis-stress model says disorders emerge from the interaction of vulnerability and stress, a predisposition (often genetic or biological) combined with environmental stressors, so the model predicts the highest rates in people who have both, which is what (C) describes. (B) reflects a pure biological determinism account, which the diathesis-stress model rejects. (D) reflects a purely environmental account, which is equally incompatible with the interaction the model specifies. (A) is the true-but-irrelevant distractor: null results are meaningful in research generally, but they would fail to support the diathesis-stress model rather than support it. [Practice 2]

Question 4. The table below shows lifetime prevalence estimates (hypothetical) for three disorder categories based on a large community survey.

Disorder category	Lifetime prevalence (%)
Any anxiety disorder	31
Any depressive disorder	21
Schizophrenia spectrum	1

Based only on these data, which statement is best supported?

• A) Anxiety disorders are the most severe of the three categories listed.
• B) Lifetime prevalence is highest for anxiety disorders and lowest for schizophrenia spectrum disorders in this sample. ✓
• C) Schizophrenia spectrum disorders are becoming less common over time.
• D) The biopsychosocial model directly predicts these specific prevalence rates

Explanation: The table directly reports the ordering in (B): anxiety disorders at 31%, depressive disorders at 21%, and schizophrenia spectrum at 1%, no inference beyond reading the data is required. (A) is the true-but-irrelevant distractor: severity and prevalence are separate constructs, and schizophrenia is generally regarded as more severe despite being less prevalent, so the table tells you nothing about severity. (C) requires longitudinal data across time points, which this single-survey table does not provide. (D) misuses the biopsychosocial model, which is an etiological framework rather than a predictive model of specific prevalence rates. [Practice 3]

Question 5. A clinician is evaluating a client who reports hearing voices that others do not hear. Before assigning a diagnosis, the clinician carefully considers the client's cultural and religious background, asks whether the experience causes distress or impairment, and consults colleagues familiar with the client's community. Which combination of ideas is the clinician most clearly integrating?

• A) The medical model alone, since hearing voices is a classic symptom of psychosis
• B) Rosenhan's conclusion that psychiatric diagnosis is inherently unreliable, so diagnosis should be avoided.
• C) The diathesis-stress model, which requires identifying a specific genetic vulnerability before diagnosis.
• D) DSM-5-TR guidance to consider cultural context before classifying an experience as disordered, together with the criterion of distress or impairment. ✓

Explanation: The DSM-5-TR directs clinicians to weigh cultural context when evaluating experiences that might otherwise appear disordered, and to consider whether the experience produces distress or functional impairment, both of which the clinician is doing here. (A) reflects a common misconception: the medical model focuses on biological causes of symptoms, but treating "hearing voices" as automatically disordered without cultural context is exactly what the DSM-5-TR warns against. (C) is the true-but-irrelevant distractor, the diathesis-stress model is a real and widely used framework, but it describes how disorders develop and does not require genetic testing before diagnosis; that overstates the model. (B) overgeneralizes Rosenhan's critique into a blanket rejection of diagnosis, which is not what Rosenhan or the field concluded. The cross-unit connection is to sociocultural considerations that recur across the course. [Practice 1]