MCAT Psychological Social Foundations Quiz: 7a Psychological Disorders Classification

What this quiz covers

This quiz focuses on 7a Psychological Disorders Classification, giving you a quick way to practice the rules, question types, and explanations that matter most for MCAT Psychological Social Foundations.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

1. To provide standardized diagnostic criteria for psychological disorders. (correct answer)
2. To explain the definitive etiology and pathophysiology of all recognized mental illnesses.
3. To mandate specific evidence-based treatment protocols for clinicians to follow.
4. To catalog the prevalence and incidence rates of psychological disorders worldwide.

Explanation: The primary function of the DSM-5 is to provide a common language and standard criteria for the classification of mental disorders. This standardization improves the reliability of diagnoses, which is essential for clinical practice, research, and communication among healthcare professionals. While the DSM-5 may mention etiology (B), treatment options (C), and epidemiological data (D), its core purpose is diagnostic classification.

Question 2

1. The behavior is statistically rare or deviant from social norms.
2. The individual's thought patterns are irrational and illogical.
3. The behavior or mental process causes significant distress or functional impairment. (correct answer)
4. The condition has a clearly identified biological or genetic cause.

Explanation: The 'three D's' (or sometimes four: deviance, distress, dysfunction, danger) are often used to define psychological disorders. Of these, significant personal distress or impairment in social, occupational, or other important areas of functioning is a key criterion. Statistical deviance (A) alone is not sufficient (e.g., genius is deviant). Irrational thoughts (B) are a feature of some, but not all, disorders. A known biological cause (D) is not required for diagnosis, and for many disorders, the exact cause is unknown.

Question 3

1. anhedonia (correct answer)
2. avolition
3. alogia
4. affective flattening

Explanation: Anhedonia is the term for the inability to experience pleasure from activities usually found enjoyable, a core symptom of MDD. Avolition (B), alogia (C), and affective flattening (D) are all considered negative symptoms of schizophrenia. Avolition is a decrease in motivated, self-initiated purposeful activities; alogia is diminished speech output; and affective flattening is a reduction in the range and intensity of emotional expression.

Question 4

1. The severity of the depressive episodes
2. The presence of at least one full manic episode (correct answer)
3. The presence of psychotic symptoms
4. The age of onset of the disorder

Explanation: The defining distinction is the presence of a manic episode. Bipolar I Disorder is diagnosed after at least one manic episode, which may or may not be accompanied by depressive episodes. Bipolar II Disorder is characterized by at least one hypomanic episode (a less severe form of mania) and at least one major depressive episode. While depressive episodes are part of Bipolar II criteria (A), their severity doesn't distinguish it from Bipolar I. Psychosis (C) can occur in both, and age of onset (D) is not a diagnostic criterion.

Question 5

1. a delusion of grandeur
2. a delusion of persecution
3. a delusion of reference (correct answer)
4. an auditory hallucination

Explanation: Delusions of reference involve the belief that ordinary events, objects, or the behavior of others have a particular and unusual meaning specifically for oneself. The patient's belief that a novel's characters are communicating with her fits this definition. Delusions of grandeur (A) involve an exaggerated sense of self-importance. Delusions of persecution (B) involve the belief that one is being harmed or plotted against. An auditory hallucination (D) is a false sensory perception of sound, not a belief system.

Question 6

1. Histrionic Personality Disorder
2. Antisocial Personality Disorder
3. Borderline Personality Disorder
4. Narcissistic Personality Disorder (correct answer)

Explanation: Narcissistic Personality Disorder is defined by the three core features listed: grandiosity, a need for admiration, and a lack of empathy. Histrionic Personality Disorder (A) is characterized by excessive emotionality and attention-seeking. Antisocial Personality Disorder (B) involves a disregard for and violation of the rights of others. Borderline Personality Disorder (C) is characterized by instability in relationships, self-image, and affects, along with impulsivity.

Question 7

1. individuals with Schizoid PD desire social relationships but fear them, while those with Avoidant PD have no interest in them.
2. individuals with Avoidant PD desire social relationships but fear rejection, while those with Schizoid PD are genuinely indifferent to them. (correct answer)
3. individuals with Schizoid PD exhibit magical thinking, while those with Avoidant PD have stable, reality-based cognitions.
4. individuals with Avoidant PD are from Cluster B, while those with Schizoid PD are from Cluster C.

Explanation: This is a classic differential diagnosis. The core distinction is motivation for social contact. People with Avoidant Personality Disorder are lonely and want relationships but avoid them due to an intense fear of criticism and rejection. People with Schizoid Personality Disorder have a pervasive pattern of detachment from social relationships and a restricted range of emotional expression; they genuinely prefer to be alone. (A) reverses the distinction. (C) describes Schizotypal PD, not Schizoid PD. (D) has the clusters wrong; Schizoid is Cluster A and Avoidant is Cluster C.

Question 8

1. Acute Stress Disorder
2. Post-Traumatic Stress Disorder (correct answer)
3. Generalized Anxiety Disorder
4. Dissociative Identity Disorder

Explanation: The question describes the four main symptom clusters of Post-Traumatic Stress Disorder (PTSD): intrusion, avoidance, negative alterations in cognitions and mood, and marked alterations in arousal and reactivity. Acute Stress Disorder (A) has similar symptoms but is diagnosed when the duration is from 3 days to 1 month after the trauma; PTSD is diagnosed if symptoms last longer than a month. GAD (C) and DID (D) have different core features.

Question 9

1. a genetic predisposition to psychosis.
2. an imbalance of key neurotransmitters, particularly serotonin.
3. a defense mechanism against severe, repetitive childhood trauma. (correct answer)
4. a neurological condition affecting memory centers in the temporal lobe.

Explanation: The most widely accepted etiological model for DID is the post-traumatic model, which posits that the disorder develops as a response to overwhelming childhood trauma, typically severe and chronic abuse. Dissociation and the formation of alternate identities serve as a coping or defense mechanism to distance the self from the traumatic experiences. The other options are more relevant to psychotic disorders (A), mood disorders (B), or organic amnesias (D).

Question 10

1. exhibit a lack of empathy since early childhood.
2. have evidence of Conduct Disorder with onset before age 15. (correct answer)
3. experience a concurrent substance use disorder.
4. be unable to form any long-term social attachments.

Explanation: A specific criterion for the diagnosis of Antisocial Personality Disorder is that the individual must be at least 18 years old and have a history of some symptoms of Conduct Disorder before age 15. This criterion establishes the long-standing, pervasive nature of the disregard for others' rights. While lack of empathy (A) is a feature, and substance use (C) is often comorbid, they are not specific diagnostic requirements in the same way as the history of Conduct Disorder. (D) is an overstatement; some individuals can form attachments, though they are often exploitative.

Question 11

1. The dopamine hypothesis
2. The cortisol theory of stress
3. The monoamine hypothesis (correct answer)
4. The neuroplasticity theory

Explanation: The monoamine hypothesis of depression suggests that the underlying pathophysiologic basis of depression is a depletion in the levels of the neurotransmitters serotonin, norepinephrine, and/or dopamine in the central nervous system. The serotonin transporter gene (5-HTTLPR) directly affects the function of the serotonin system, making it a key area of investigation within the monoamine hypothesis. The other theories relate to different neurotransmitters (A), hormones (B), or brain processes (D).

Question 12

1. Schizophrenia
2. Schizophreniform Disorder
3. Delusional Disorder
4. Brief Psychotic Disorder (correct answer)

Explanation: Brief Psychotic Disorder is characterized by the presence of one or more psychotic symptoms (delusions, hallucinations, disorganized speech, grossly disorganized behavior) with a duration of at least one day but less than one month, with an eventual full return to premorbid functioning. Schizophreniform Disorder (B) has a duration of 1 to 6 months. Schizophrenia (A) requires symptoms to persist for at least 6 months. Delusional Disorder (C) involves delusions but not the other prominent psychotic symptoms like hallucinations or disorganized speech.

Question 13

1. Combined presentation
2. Predominantly hyperactive/impulsive presentation
3. Predominantly inattentive presentation (correct answer)
4. ADHD cannot be diagnosed without hyperactivity.

Explanation: ADHD has three presentations. The child's symptoms (difficulty sustaining attention, easily distracted, fails to finish tasks) are all characteristic of inattention. The specific absence of hyperactivity and impulsivity points to the predominantly inattentive presentation. (A) would require symptoms of both inattention and hyperactivity/impulsivity. (B) would involve symptoms like fidgeting, running about, and interrupting others. (D) is incorrect, as hyperactivity is not required for the diagnosis.

Question 14

1. Somatic Symptom Disorder
2. Illness Anxiety Disorder (correct answer)
3. Conversion Disorder
4. Delusional Disorder, somatic type

Explanation: Illness Anxiety Disorder is characterized by a preoccupation with having or acquiring a serious illness, in the absence of significant somatic symptoms. The student's fear of having a brain tumor, excessive health-related behaviors (researching, checking), and high anxiety, despite medical reassurance, are the core features of this disorder. Somatic Symptom Disorder (A) would require the presence of one or more distressing somatic symptoms. Conversion Disorder (C) involves a specific neurological symptom. Delusional Disorder (D) is considered if the belief is held with delusional intensity, but Illness Anxiety Disorder is more specific to this presentation, where the primary feature is anxiety about illness.

Question 15

1. lacks sufficient empirical evidence to support its diagnostic categories.
2. is overly reliant on psychoanalytic theories of the unconscious mind.
3. medicalizes behaviors and feelings that may be normal reactions to adverse social conditions. (correct answer)
4. fails to provide a common language for mental health professionals.

Explanation: From a sociological perspective, a key criticism of the DSM is its tendency to pathologize and medicalize problems that may stem from social issues like poverty, inequality, or oppression. By locating the problem within the individual's brain or mind, this approach can neglect the societal context and contributing factors. (A) is a criticism, but more from a scientific/clinical psychology viewpoint. (B) is outdated, as the DSM has moved away from psychoanalytic theory. (D) is the opposite of the DSM's intended purpose.

Question 16

1. Paranoid Personality Disorder (correct answer)
2. Schizotypal Personality Disorder
3. Antisocial Personality Disorder
4. Avoidant Personality Disorder

Explanation: Paranoid Personality Disorder, part of Cluster A, is defined by a pervasive and unjustified distrust and suspicion of others. Individuals with this disorder are constantly on guard, believing others are trying to harm them. Schizotypal PD (B) involves odd beliefs and social anxiety. Antisocial PD (C) involves disregard for others' rights, not necessarily paranoia. Avoidant PD (D) involves fear of rejection, not suspicion of malevolent intent.

Question 17

1. 4 consecutive days.
2. 1 week. (correct answer)
3. 2 weeks.
4. 1 month.

Explanation: According to DSM-5 criteria, a full manic episode must last for at least one week and be present most of the day, nearly every day (or any duration if hospitalization is necessary). The 4-day duration (A) is the minimum for a hypomanic episode. The 2-week duration (C) is the minimum for a major depressive episode.

Question 18

1. The biomedical approach
2. The psychoanalytic approach
3. The sociocultural approach (correct answer)
4. The cognitive-behavioral approach

Explanation: The sociocultural approach specifically examines how social and cultural factors—such as poverty, discrimination, social labels, and cultural-bound syndromes—influence the prevalence, presentation, and treatment of psychological disorders. The biomedical approach (A) focuses on physiological causes. The psychoanalytic approach (B) focuses on unconscious conflicts. The cognitive-behavioral approach (D) focuses on maladaptive thoughts and learned behaviors.

Question 19

1. biomedical model.
2. diathesis-stress model. (correct answer)
3. sociocultural model.
4. behavioral model.

Explanation: The diathesis-stress model posits that psychological disorders develop as a result of an interaction between a predisposing vulnerability (the diathesis, in this case, the genetic polymorphism) and a precipitating event or factor (the stress, in this case, life stressors). The study's design, which examines the interaction between a genetic factor and environmental stress, is a direct application of this model. The biomedical model (A) would focus solely on the gene, while the sociocultural (C) or behavioral (D) models would focus on other factors without this specific interactionist perspective.

Question 20

1. Histrionic Personality Disorder
2. Borderline Personality Disorder (correct answer)
3. Dependent Personality Disorder
4. Bipolar II Disorder

Explanation: The described symptoms—unstable relationships (idealization/devaluation), identity disturbance, chronic emptiness, and impulsivity/self-harm—are all hallmark features of Borderline Personality Disorder (BPD). Histrionic PD (A) is more centered on attention-seeking. Dependent PD (C) involves a pervasive need to be taken care of. While BPD involves mood instability, the pattern described is more pervasive and identity-based than the distinct episodes of hypomania and depression seen in Bipolar II Disorder (D).