Certified Brain Injury Specialist (CBIS) Exam
2026/2027 | ACBIS & BIAA Certification Study Guide,
CBIS Practice Questions & Answers, Brain Injury
Specialist Exam Prep, TBI, ABI, Neuroanatomy,
Neuroimaging, Brain Injury Assessment, Cognition,
Communication, Behavior, Rehabilitation, Recovery,
Community Reintegration & Detailed Rationales
Question 1: A patient presents with profound personality changes,
disinhibition, and difficulty planning future actions after a traumatic
brain injury. Which lobe of the brain is most likely injured?
A. Parietal lobe
B. Occipital lobe
C. Frontal lobe
D. Temporal lobe
CORRECT ANSWER: C. Frontal lobe
Rationale: The frontal lobe is responsible for executive functions including
planning, organization, and personality regulation. Damage to this area
leads to disinhibition and impaired judgment, which are hallmark signs of
frontal lobe injury.
Question 2: Which structure acts as the primary relay station for
sensory information (except smell) to the cerebral cortex?
A. Hypothalamus
B. Thalamus
C. Pons
D. Reticular formation
CORRECT ANSWER: B. Thalamus
Rationale: The thalamus serves as the brain's sensory relay station,
transmitting all sensory information except olfaction to the appropriate
cortical areas. The hypothalamus regulates autonomic and endocrine
functions, while the pons and reticular formation are involved in sleep and
arousal.
Question 3: Damage to the hippocampus, located in the medial
temporal lobe, primarily results in which deficit?
,A. Inability to coordinate voluntary movement
B. Difficulty forming new memories (Anterograde amnesia)
C. Loss of visual field (hemianopsia)
D. Inability to comprehend language
CORRECT ANSWER: B. Difficulty forming new memories (Anterograde
amnesia)
Rationale: The hippocampus is essential for consolidating short-term
memory into long-term memory. Damage to this structure results in
anterograde amnesia, which is the inability to form new episodic memories
after the injury.
Question 4: Which part of the brain is primarily responsible for
maintaining balance and coordination?
A. Medulla oblongata
B. Cerebellum
C. Corpus callosum
D. Amygdala
CORRECT ANSWER: B. Cerebellum
Rationale: The cerebellum coordinates voluntary movement, balance, and
posture. Damage to this structure results in ataxia, intention tremor, and
gait disturbances. The medulla controls vital autonomic functions, the
corpus callosum connects hemispheres, and the amygdala processes
emotion.
Question 5: A patient who suffered a TBI presents with bitemporal
hemianopsia. Where is the lesion most likely located?
A. Optic chiasm
B. Left occipital lobe
C. Right optic nerve
D. Frontal eye fields
CORRECT ANSWER: A. Optic chiasm
Rationale: The optic chiasm is where fibers from the nasal retina cross.
Compression or damage at this site causes loss of the temporal visual
fields in both eyes, a condition known as bitemporal hemianopsia.
,Question 6: What is the primary function of the reticular activating
system (RAS)?
A. Motor control
B. Arousal and consciousness
C. Temperature regulation
D. Hunger and satiety
CORRECT ANSWER: B. Arousal and consciousness
Rationale: The RAS is a network of neurons in the brainstem that regulates
wakefulness, alertness, and the sleep-wake cycle. Damage to this system
can result in coma or persistent vegetative state.
Question 7: Which cranial nerve is responsible for pupil constriction
and accommodation?
A. CN II (Optic)
B. CN III (Oculomotor)
C. CN V (Trigeminal)
D. CN VII (Facial)
CORRECT ANSWER: B. CN III (Oculomotor)
Rationale: The oculomotor nerve (CN III) controls most eye movements and
contains parasympathetic fibers responsible for pupil constriction and lens
accommodation. CN II is sensory for vision, CN V is for facial sensation,
and CN VII controls facial expression.
Question 8: In the context of TBI pathophysiology, what defines
"primary injury"?
A. The biochemical cascade occurring after the initial impact
B. The neuronal damage occurring at the moment of impact
C. The cerebral edema that develops over hours
D. The inflammatory response triggered by cell death
CORRECT ANSWER: B. The neuronal damage occurring at the moment
of impact
Rationale: Primary injury refers to the immediate structural damage that
occurs at the moment of impact, including contusions, lacerations, and
axonal shearing. Secondary injury involves the subsequent biochemical
cascades including edema and inflammation.
, Question 9: Diffuse axonal injury (DAI) is most commonly caused by
which mechanism?
A. Direct blow to the head
B. Rotational acceleration-deceleration forces
C. Penetrating injury
D. Hypoxic-ischemic event
CORRECT ANSWER: B. Rotational acceleration-deceleration forces
Rationale: DAI results from rotational forces that cause shearing of axons,
particularly at the gray-white matter junction. This mechanism is most
commonly associated with high-velocity motor vehicle collisions.
Question 10: What is the Glasgow Coma Scale (GCS) score range for a
severe traumatic brain injury?
A. 13-15
B. 9-12
C. 3-8
D. 1-3
CORRECT ANSWER: C. 3-8
Rationale: The Glasgow Coma Scale ranges from 3 to 15. Scores of 13-15
indicate mild TBI, 9-12 indicate moderate TBI, and 3-8 indicate severe TBI.
The GCS assesses eye opening, verbal response, and motor response.
Question 11: Which of the following best defines post-traumatic
amnesia (PTA)?
A. Memory loss for events prior to the injury
B. The interval between injury and return of continuous memory
C. The period of unconsciousness immediately following injury
D. Inability to learn new motor skills
CORRECT ANSWER: B. The interval between injury and return of
continuous memory
Rationale: Post-traumatic amnesia (PTA) is defined as the interval between
the injury and the return of continuous memory. It is considered one of the
best indicators of TBI severity and is strongly correlated with functional
outcome.
2026/2027 | ACBIS & BIAA Certification Study Guide,
CBIS Practice Questions & Answers, Brain Injury
Specialist Exam Prep, TBI, ABI, Neuroanatomy,
Neuroimaging, Brain Injury Assessment, Cognition,
Communication, Behavior, Rehabilitation, Recovery,
Community Reintegration & Detailed Rationales
Question 1: A patient presents with profound personality changes,
disinhibition, and difficulty planning future actions after a traumatic
brain injury. Which lobe of the brain is most likely injured?
A. Parietal lobe
B. Occipital lobe
C. Frontal lobe
D. Temporal lobe
CORRECT ANSWER: C. Frontal lobe
Rationale: The frontal lobe is responsible for executive functions including
planning, organization, and personality regulation. Damage to this area
leads to disinhibition and impaired judgment, which are hallmark signs of
frontal lobe injury.
Question 2: Which structure acts as the primary relay station for
sensory information (except smell) to the cerebral cortex?
A. Hypothalamus
B. Thalamus
C. Pons
D. Reticular formation
CORRECT ANSWER: B. Thalamus
Rationale: The thalamus serves as the brain's sensory relay station,
transmitting all sensory information except olfaction to the appropriate
cortical areas. The hypothalamus regulates autonomic and endocrine
functions, while the pons and reticular formation are involved in sleep and
arousal.
Question 3: Damage to the hippocampus, located in the medial
temporal lobe, primarily results in which deficit?
,A. Inability to coordinate voluntary movement
B. Difficulty forming new memories (Anterograde amnesia)
C. Loss of visual field (hemianopsia)
D. Inability to comprehend language
CORRECT ANSWER: B. Difficulty forming new memories (Anterograde
amnesia)
Rationale: The hippocampus is essential for consolidating short-term
memory into long-term memory. Damage to this structure results in
anterograde amnesia, which is the inability to form new episodic memories
after the injury.
Question 4: Which part of the brain is primarily responsible for
maintaining balance and coordination?
A. Medulla oblongata
B. Cerebellum
C. Corpus callosum
D. Amygdala
CORRECT ANSWER: B. Cerebellum
Rationale: The cerebellum coordinates voluntary movement, balance, and
posture. Damage to this structure results in ataxia, intention tremor, and
gait disturbances. The medulla controls vital autonomic functions, the
corpus callosum connects hemispheres, and the amygdala processes
emotion.
Question 5: A patient who suffered a TBI presents with bitemporal
hemianopsia. Where is the lesion most likely located?
A. Optic chiasm
B. Left occipital lobe
C. Right optic nerve
D. Frontal eye fields
CORRECT ANSWER: A. Optic chiasm
Rationale: The optic chiasm is where fibers from the nasal retina cross.
Compression or damage at this site causes loss of the temporal visual
fields in both eyes, a condition known as bitemporal hemianopsia.
,Question 6: What is the primary function of the reticular activating
system (RAS)?
A. Motor control
B. Arousal and consciousness
C. Temperature regulation
D. Hunger and satiety
CORRECT ANSWER: B. Arousal and consciousness
Rationale: The RAS is a network of neurons in the brainstem that regulates
wakefulness, alertness, and the sleep-wake cycle. Damage to this system
can result in coma or persistent vegetative state.
Question 7: Which cranial nerve is responsible for pupil constriction
and accommodation?
A. CN II (Optic)
B. CN III (Oculomotor)
C. CN V (Trigeminal)
D. CN VII (Facial)
CORRECT ANSWER: B. CN III (Oculomotor)
Rationale: The oculomotor nerve (CN III) controls most eye movements and
contains parasympathetic fibers responsible for pupil constriction and lens
accommodation. CN II is sensory for vision, CN V is for facial sensation,
and CN VII controls facial expression.
Question 8: In the context of TBI pathophysiology, what defines
"primary injury"?
A. The biochemical cascade occurring after the initial impact
B. The neuronal damage occurring at the moment of impact
C. The cerebral edema that develops over hours
D. The inflammatory response triggered by cell death
CORRECT ANSWER: B. The neuronal damage occurring at the moment
of impact
Rationale: Primary injury refers to the immediate structural damage that
occurs at the moment of impact, including contusions, lacerations, and
axonal shearing. Secondary injury involves the subsequent biochemical
cascades including edema and inflammation.
, Question 9: Diffuse axonal injury (DAI) is most commonly caused by
which mechanism?
A. Direct blow to the head
B. Rotational acceleration-deceleration forces
C. Penetrating injury
D. Hypoxic-ischemic event
CORRECT ANSWER: B. Rotational acceleration-deceleration forces
Rationale: DAI results from rotational forces that cause shearing of axons,
particularly at the gray-white matter junction. This mechanism is most
commonly associated with high-velocity motor vehicle collisions.
Question 10: What is the Glasgow Coma Scale (GCS) score range for a
severe traumatic brain injury?
A. 13-15
B. 9-12
C. 3-8
D. 1-3
CORRECT ANSWER: C. 3-8
Rationale: The Glasgow Coma Scale ranges from 3 to 15. Scores of 13-15
indicate mild TBI, 9-12 indicate moderate TBI, and 3-8 indicate severe TBI.
The GCS assesses eye opening, verbal response, and motor response.
Question 11: Which of the following best defines post-traumatic
amnesia (PTA)?
A. Memory loss for events prior to the injury
B. The interval between injury and return of continuous memory
C. The period of unconsciousness immediately following injury
D. Inability to learn new motor skills
CORRECT ANSWER: B. The interval between injury and return of
continuous memory
Rationale: Post-traumatic amnesia (PTA) is defined as the interval between
the injury and the return of continuous memory. It is considered one of the
best indicators of TBI severity and is strongly correlated with functional
outcome.
