CNS Motor Control and Motor Learning 2 — Questions and Answers
Question 1: Contextual interference in motor learning refers to:
- Environmental distractions that impair concentration during motor task practice
- The interference created by practicing multiple skills in a random order, which enhances long-term learning (Correct answer)
- Competing motor programs stored in memory that interfere with new skill acquisition
- Sensory input from the environment that disrupts the execution of motor programs
Correct answer: The interference created by practicing multiple skills in a random order, which enhances long-term learning
Contextual interference is the functional interference created when multiple skills are practiced in random order; although it disrupts initial acquisition, it enhances long-term retention and transfer.
Question 2: Bernstein's 'degrees of freedom problem' in motor control refers to:
- The inability of patients with CNS lesions to control fine motor movements
- The challenge the nervous system faces in controlling the many independent joints and muscles available for movement (Correct answer)
- The limited range of motion available at joints affected by neurological injury
- The difficulty in selecting appropriate movement strategies in complex environments
Correct answer: The challenge the nervous system faces in controlling the many independent joints and muscles available for movement
Bernstein's degrees of freedom problem refers to the challenge of selecting and coordinating the enormous number of independent joints and muscles (degrees of freedom) available in the motor system.
Question 3: Which augmented feedback schedule BEST promotes long-term motor learning by fostering the development of internal error detection?
- Continuous feedback provided after every practice trial
- Summary feedback provided after every 10 trials
- Faded feedback that decreases in frequency as practice progresses (Correct answer)
- Bandwidth feedback triggered only when performance falls outside set limits
Correct answer: Faded feedback that decreases in frequency as practice progresses
Faded feedback decreases in frequency over practice, promoting long-term learning by requiring the learner to increasingly rely on internal error detection mechanisms rather than external feedback.
Question 4: Transfer of training in motor learning is BEST defined as:
- The physical handoff of patient care from one therapist to another during rehabilitation
- The influence of prior practice or experience on the learning or performance of a new task (Correct answer)
- The documentation and carry-over of skills learned during inpatient rehabilitation
- The transition from supervised to independent home exercise practice
Correct answer: The influence of prior practice or experience on the learning or performance of a new task
Transfer of training refers to the gain or loss in proficiency on one task as a result of practice or experience on a different but related task.
Question 5: Feedforward motor control mechanisms are BEST characterized as:
- Corrections made to ongoing movement based on sensory error signals
- Anticipatory motor commands prepared before movement begins based on predictive internal models (Correct answer)
- Reflex arc-mediated adjustments that stabilize posture during movement
- Sensory processing that occurs after movement completion to update motor programs
Correct answer: Anticipatory motor commands prepared before movement begins based on predictive internal models
Feedforward control uses internal predictive models to anticipate and prepare motor commands before movement begins, enabling rapid, smooth movement without waiting for sensory feedback.
Question 6: The cerebellum contributes to motor learning PRIMARILY by:
- Generating initial motor programs in response to cortical commands via the corticospinal tract
- Comparing intended movements with actual movements and using error signals to update future motor programs (Correct answer)
- Inhibiting unwanted movements through dopaminergic reward and punishment pathways
- Initiating voluntary movement sequences through direct projections to spinal motor neurons
Correct answer: Comparing intended movements with actual movements and using error signals to update future motor programs
The cerebellum functions as a comparator, receiving copies of motor commands and comparing them with actual sensory outcomes to generate error signals that refine future motor programs.
Question 7: Which of the following BEST represents the principle of task-specific training in neurological rehabilitation?
- Breaking tasks into components and practicing each in isolation before combining them
- Practicing the actual functional task in its relevant context to drive specific neural adaptations (Correct answer)
- Adapting tasks to match the patient's current capability to ensure success on every trial
- Using virtual reality environments to safely simulate functional task demands
Correct answer: Practicing the actual functional task in its relevant context to drive specific neural adaptations
Task-specific training involves practicing the actual functional task in its relevant context because neural adaptations are most specific to what is practiced, optimizing transfer to real-world performance.
CNS Motor Control and Motor Learning 2
Contextual interference in motor learning refers to: