CSRS Neuroplasticity & Motor Recovery 2 — Questions and Answers
Question 1: According to Brunnstrom's stages of motor recovery, what characterizes Stage 3?
- Voluntary movement is possible but only within obligatory synergy patterns, with spasticity at its peak (Correct answer)
- Complete flaccidity with no voluntary movement present
- Near-normal movement with only subtle coordination deficits
- Isolated joint movements independent of mass synergy patterns
Correct answer: Voluntary movement is possible but only within obligatory synergy patterns, with spasticity at its peak
Brunnstrom Stage 3 is defined by the appearance of voluntary movement confined to abnormal flexion or extension synergy patterns, coinciding with maximal spasticity.
Question 2: Which factor is considered most critical for driving neuroplasticity and functional motor recovery after stroke?
- High-intensity, task-specific, repetitive practice (Correct answer)
- Prolonged bed rest to allow spontaneous recovery
- Pharmacological intervention as the sole treatment modality
- Passive range-of-motion exercises performed by the therapist
Correct answer: High-intensity, task-specific, repetitive practice
High-intensity, task-specific, repetitive practice is the most potent driver of neuroplasticity because it repeatedly activates target neural circuits, promoting synaptic strengthening and cortical reorganization.
Question 3: What is Brain-Derived Neurotrophic Factor (BDNF) and its significance in stroke recovery?
- A neurotrophin that promotes neuron survival, synaptic growth, and neuroplasticity, increased by aerobic exercise (Correct answer)
- A thrombolytic agent used to restore blood flow during acute stroke
- A contrast agent injected during brain MRI to identify infarcted tissue
- A neurotransmitter that inhibits excitatory activity to prevent excitotoxicity
Correct answer: A neurotrophin that promotes neuron survival, synaptic growth, and neuroplasticity, increased by aerobic exercise
BDNF is a key protein that supports neuronal survival, promotes synaptic plasticity, and facilitates motor learning; aerobic exercise significantly upregulates BDNF expression in the brain.
Question 4: What is the primary neuroplastic mechanism targeted by Constraint-Induced Movement Therapy (CIMT)?
- Overcoming learned non-use of the affected extremity by restraining the unaffected limb and forcing use of the impaired arm (Correct answer)
- Reducing upper limb spasticity through repetitive botulinum toxin injections
- Improving postural control through structured vestibular rehabilitation
- Strengthening the unaffected limb to improve overall functional independence
Correct answer: Overcoming learned non-use of the affected extremity by restraining the unaffected limb and forcing use of the impaired arm
CIMT targets learned non-use by physically constraining the intact limb, compelling the patient to use the affected arm and inducing cortical reorganization in motor areas.
Question 5: What is axonal sprouting in the context of post-stroke neuroplasticity?
- Growth of new branches from intact surviving axons that form new synaptic connections with denervated neurons (Correct answer)
- Progressive degeneration of damaged axons in the infarct core
- Pruning of excessive synaptic connections during recovery
- Accelerated myelination of previously unmyelinated axonal segments
Correct answer: Growth of new branches from intact surviving axons that form new synaptic connections with denervated neurons
Axonal sprouting involves surviving neurons extending new axon collaterals to form synapses with neurons that lost their original input, contributing to functional circuit restoration.
Question 6: Which of the following best describes the concept of 'learned non-use' after stroke?
- A conditioned suppression of affected limb use arising from repeated early failures, persisting even when neurological recovery would allow function (Correct answer)
- A therapeutic strategy in which patients are taught to rely on their unaffected limb
- The brain's automatic mechanism for protecting damaged neural tissue from overactivation
- A pharmacological approach to reduce motor cortex excitability in the acute phase
Correct answer: A conditioned suppression of affected limb use arising from repeated early failures, persisting even when neurological recovery would allow function
Learned non-use is a behavioral conditioning phenomenon in which early post-stroke failures condition the patient to abandon attempts to use the affected limb, masking true recovery potential.
Question 7: What is the primary role of dopamine in motor recovery and neuroplasticity after stroke?
- It modulates synaptic plasticity and motor learning through reward-based circuits, facilitating activity-dependent reorganization (Correct answer)
- It directly stimulates neuromuscular junctions to restore voluntary muscle contraction
- It reduces perilesional inflammation by suppressing microglial activation
- It promotes angiogenesis to restore blood supply to the ischemic penumbra
Correct answer: It modulates synaptic plasticity and motor learning through reward-based circuits, facilitating activity-dependent reorganization
Dopamine plays a critical role in modulating reward-based motor learning circuits and activity-dependent plasticity, which is why dopaminergic agents have been investigated as adjuncts to stroke rehabilitation.
CSRS Neuroplasticity & Motor Recovery 2
According to Brunnstrom's stages of motor recovery, what characterizes Stage 3?