NURS 660 Exam 4 Actual Exam 2026/2027
100% Verified | Detailed Rationales – Pass
Guaranteed – A+ Graded
Content Area Overview
This actual examination reflects the advanced psychopharmacology and mental health knowledge
required for success on the NURS 660 Exam 4 at Maryville University. It is designed to evaluate the
student's understanding of ADHD pathophysiology and pharmacotherapy, dementia and Alzheimer's
disease treatments, substance use disorders, and medication management across psychiatric conditions.
Questions are structured to assess recall of key concepts, application of clinical reasoning to patient
scenarios, and analysis of complex psychiatric presentations. This authentic question bank serves as a
comprehensive resource for PMHNP students demonstrating mastery of psychopharmacology content
for the 2026/2027 academic year.
Section 1: ADHD Pathophysiology & Neuroanatomy (Questions 1–12)
Q1. A 9-year-old boy is referred for evaluation due to difficulty completing homework, frequent
daydreaming in class, and trouble sustaining attention during reading tasks. His teacher reports he can
start assignments but loses focus within minutes. Which brain region is most directly implicated in this
pattern of sustained attention deficits?
A. Orbitofrontal cortex
B. Dorsolateral prefrontal cortex (DLPFC)
C. Dorsal anterior cingulate cortex (dACC)
D. Prefrontal motor cortex
Rationale: The best answer is B. The dorsolateral prefrontal cortex (DLPFC) is the primary region
responsible for sustained attention and working memory, which explains why this child can initiate tasks
but cannot maintain focus over time. The orbitofrontal cortex governs impulse control, the dACC
handles selective attention and error detection, and the prefrontal motor cortex regulates hyperactive
motor output—none of which directly account for the sustained attention pattern described here.
Correct Answer: B
,Q2. A 12-year-old girl with ADHD is described by her parents as "unable to sit still," constantly fidgeting,
tapping her feet, and leaving her seat during meals. Which neuroanatomical region best explains this
hyperactive motor presentation?
A. Dorsal striatum
B. Ventral striatum
C. Prefrontal motor cortex
D. Dorsal anterior cingulate cortex (dACC)
Rationale: The best answer is C. The prefrontal motor cortex is specifically implicated in the regulation
of motor activity and hyperactivity in ADHD, which aligns perfectly with this child's restless, fidgeting
behavior. The dorsal and ventral striatum relate more to compulsivity and reward-driven impulsivity
respectively, while the dACC manages selective attention and cognitive conflict—not primary motor
hyperactivity.
Correct Answer: C
Q3. During a neuropsychological evaluation, a 15-year-old with ADHD is administered the Stroop test.
The PMHNP explains to the family that this test primarily assesses which cognitive function most
relevant to ADHD?
A. Working memory capacity
B. Selective attention and cognitive inhibition
C. Sustained vigilance over time
D. Motor response inhibition
Rationale: The best answer is B. The Stroop test is a classic measure of selective attention and the ability
to inhibit prepotent (automatic) responses, which directly maps onto the dorsal anterior cingulate
cortex (dACC) dysfunction seen in ADHD. Working memory is better assessed with the N-back test,
sustained vigilance with continuous performance tasks, and motor inhibition with go/no-go paradigms—
so the other options don't match what the Stroop actually evaluates.
Correct Answer: B
Q4. A PMHNP is explaining ADHD neurobiology to a patient's family and states that the dorsal striatum
is associated with compulsive, rigid behaviors, while the ventral striatum is linked to impulsive, reward-
driven actions. This distinction is important because it helps explain which clinical phenomenon?
A. Why stimulant medications improve both hyperactivity and inattention
B. Why some children with ADHD develop comorbid obsessive-compulsive traits
, C. Why behavioral parent training is ineffective for severe ADHD
D. Why ADHD symptoms improve naturally during adolescence
Rationale: The best answer is B. The dorsal-ventral striatum distinction is clinically meaningful because it
explains why some children with ADHD—who have ventral striatal impulsivity—may also develop
compulsive, rigid behaviors associated with dorsal striatal dysfunction, leading to comorbid OCD-like
presentations. This neuroanatomical framework doesn't explain medication mechanisms, behavioral
therapy efficacy, or natural symptom remission patterns, which are driven by different factors.
Correct Answer: B
Q5. A 10-year-old boy with ADHD frequently blurts out answers in class, interrupts conversations, and
makes impulsive purchases with his allowance without considering consequences. His PMHNP correlates
these behaviors with dysfunction in which specific prefrontal region?
A. Dorsolateral prefrontal cortex (DLPFC)
B. Dorsal anterior cingulate cortex (dACC)
C. Orbitofrontal cortex
D. Prefrontal motor cortex
Rationale: The best answer is C. The orbitofrontal cortex is the key region governing impulse control,
reward evaluation, and decision-making, which directly explains this child's pattern of blurting,
interrupting, and impulsive spending. The DLPFC handles sustained attention, the dACC manages
selective attention and conflict monitoring, and the prefrontal motor cortex regulates motor
hyperactivity—none of which primarily account for the social and reward-based impulsivity described
here.
Correct Answer: C
Q6. A 16-year-old with ADHD is participating in a research study using the N-back test. The PMHNP
knows this test is designed to measure which cognitive domain most relevant to ADHD
pathophysiology?
A. Selective attention and filtering
B. Working memory and updating
C. Response inhibition
D. Processing speed
Rationale: The best answer is B. The N-back test is a well-established measure of working memory and
the ability to continuously update and manipulate information in real time, which maps directly onto
DLPFC-mediated executive dysfunction in ADHD. While processing speed can influence performance, the
100% Verified | Detailed Rationales – Pass
Guaranteed – A+ Graded
Content Area Overview
This actual examination reflects the advanced psychopharmacology and mental health knowledge
required for success on the NURS 660 Exam 4 at Maryville University. It is designed to evaluate the
student's understanding of ADHD pathophysiology and pharmacotherapy, dementia and Alzheimer's
disease treatments, substance use disorders, and medication management across psychiatric conditions.
Questions are structured to assess recall of key concepts, application of clinical reasoning to patient
scenarios, and analysis of complex psychiatric presentations. This authentic question bank serves as a
comprehensive resource for PMHNP students demonstrating mastery of psychopharmacology content
for the 2026/2027 academic year.
Section 1: ADHD Pathophysiology & Neuroanatomy (Questions 1–12)
Q1. A 9-year-old boy is referred for evaluation due to difficulty completing homework, frequent
daydreaming in class, and trouble sustaining attention during reading tasks. His teacher reports he can
start assignments but loses focus within minutes. Which brain region is most directly implicated in this
pattern of sustained attention deficits?
A. Orbitofrontal cortex
B. Dorsolateral prefrontal cortex (DLPFC)
C. Dorsal anterior cingulate cortex (dACC)
D. Prefrontal motor cortex
Rationale: The best answer is B. The dorsolateral prefrontal cortex (DLPFC) is the primary region
responsible for sustained attention and working memory, which explains why this child can initiate tasks
but cannot maintain focus over time. The orbitofrontal cortex governs impulse control, the dACC
handles selective attention and error detection, and the prefrontal motor cortex regulates hyperactive
motor output—none of which directly account for the sustained attention pattern described here.
Correct Answer: B
,Q2. A 12-year-old girl with ADHD is described by her parents as "unable to sit still," constantly fidgeting,
tapping her feet, and leaving her seat during meals. Which neuroanatomical region best explains this
hyperactive motor presentation?
A. Dorsal striatum
B. Ventral striatum
C. Prefrontal motor cortex
D. Dorsal anterior cingulate cortex (dACC)
Rationale: The best answer is C. The prefrontal motor cortex is specifically implicated in the regulation
of motor activity and hyperactivity in ADHD, which aligns perfectly with this child's restless, fidgeting
behavior. The dorsal and ventral striatum relate more to compulsivity and reward-driven impulsivity
respectively, while the dACC manages selective attention and cognitive conflict—not primary motor
hyperactivity.
Correct Answer: C
Q3. During a neuropsychological evaluation, a 15-year-old with ADHD is administered the Stroop test.
The PMHNP explains to the family that this test primarily assesses which cognitive function most
relevant to ADHD?
A. Working memory capacity
B. Selective attention and cognitive inhibition
C. Sustained vigilance over time
D. Motor response inhibition
Rationale: The best answer is B. The Stroop test is a classic measure of selective attention and the ability
to inhibit prepotent (automatic) responses, which directly maps onto the dorsal anterior cingulate
cortex (dACC) dysfunction seen in ADHD. Working memory is better assessed with the N-back test,
sustained vigilance with continuous performance tasks, and motor inhibition with go/no-go paradigms—
so the other options don't match what the Stroop actually evaluates.
Correct Answer: B
Q4. A PMHNP is explaining ADHD neurobiology to a patient's family and states that the dorsal striatum
is associated with compulsive, rigid behaviors, while the ventral striatum is linked to impulsive, reward-
driven actions. This distinction is important because it helps explain which clinical phenomenon?
A. Why stimulant medications improve both hyperactivity and inattention
B. Why some children with ADHD develop comorbid obsessive-compulsive traits
, C. Why behavioral parent training is ineffective for severe ADHD
D. Why ADHD symptoms improve naturally during adolescence
Rationale: The best answer is B. The dorsal-ventral striatum distinction is clinically meaningful because it
explains why some children with ADHD—who have ventral striatal impulsivity—may also develop
compulsive, rigid behaviors associated with dorsal striatal dysfunction, leading to comorbid OCD-like
presentations. This neuroanatomical framework doesn't explain medication mechanisms, behavioral
therapy efficacy, or natural symptom remission patterns, which are driven by different factors.
Correct Answer: B
Q5. A 10-year-old boy with ADHD frequently blurts out answers in class, interrupts conversations, and
makes impulsive purchases with his allowance without considering consequences. His PMHNP correlates
these behaviors with dysfunction in which specific prefrontal region?
A. Dorsolateral prefrontal cortex (DLPFC)
B. Dorsal anterior cingulate cortex (dACC)
C. Orbitofrontal cortex
D. Prefrontal motor cortex
Rationale: The best answer is C. The orbitofrontal cortex is the key region governing impulse control,
reward evaluation, and decision-making, which directly explains this child's pattern of blurting,
interrupting, and impulsive spending. The DLPFC handles sustained attention, the dACC manages
selective attention and conflict monitoring, and the prefrontal motor cortex regulates motor
hyperactivity—none of which primarily account for the social and reward-based impulsivity described
here.
Correct Answer: C
Q6. A 16-year-old with ADHD is participating in a research study using the N-back test. The PMHNP
knows this test is designed to measure which cognitive domain most relevant to ADHD
pathophysiology?
A. Selective attention and filtering
B. Working memory and updating
C. Response inhibition
D. Processing speed
Rationale: The best answer is B. The N-back test is a well-established measure of working memory and
the ability to continuously update and manipulate information in real time, which maps directly onto
DLPFC-mediated executive dysfunction in ADHD. While processing speed can influence performance, the
