Strategies to Improve Motor Function Flashcards
Motor control
Area of study dealing with the understanding of the neural, physical, and behavioral aspects of movement
Motor control sequence
stimulus –> stim identification –> response selection –> response programming –> movement output
Who’s associated with Reflex theory?
Sherrington.
What is reflex theory?
stimulus –> response sequence of events
Limitations of reflex theory
Voluntary movements can be activated without sensory input
Speed of movements; some so fast that no feedback
Variety of motor responses to same stimulus
Who is associated with Hierarchical theory?
Hughlings Jackson
What is Hierarchical theory?
CNS organized into 3 levels: high, middle, and low centers. Control proceeds in a descending direction from higher to lower centers, “top-down”
Modern model of Hierarchical theory highest level
association cortex; elaborating perceptions, and planning strategies
Modern model of Hierarchical theory middle level
sensorimotor cortex along with basal ganglia, brainstem, cerebellum
Modern model of Hierarchical theory lowest level
spinal cord, resulting in execution of movement
Who is associated with Systems Theory?
Bernstein
What is systems theory?
Cooperative actions of many systems; internal and external factors; shifting locus of control: distributed model of control
Coordinative structures simplify control with coordinated patterns or synergies
(Central patterns generators (locomotion) &
Postural synergies - normal)
Who is associated with Systems Model?
Vereijken
What is systems model?
3 levels:
Novice: learner simplifies the movement to reduce the degrees of freedom
Advanced: learner begins to release additional degrees of freedom; muscle synergies used to produce coordinated movement
Expert: learner has released all degrees of freedom, optimizes efficiency of movement
Open loop control system
absence of peripheral feedback and error detection
Closed loop control system
Feedback, reference for correct movement, can initiate corrections
Motor learning
A set of internal processes associated with practice or experience leading to relatively permanent changes in the capacity for skilled behavior
Aspects of motor learning
performance, retention, generalizability/adaptability, resistance to contextual change
Basic learning principles
- need to be able to problem solve & practice solutions for independent ADL
- must be possibility of success
- revert to safer/familiar patterns to solve the problem if task is difficult or unfamiliar.
- learning occurs in multiple parts of CNS
- motivation to experience the unknown is necessary
- success in learning is essential to retain motivation
Who is associated with Closed loop theory?
Adams
What is closed loop theory?
Sensory feedback compared with perceptual trace (stored memory of intended movement)
Provides reference of correctness and error detection
Practice enhances perceptual trace
Who is associated with Schema Theory?
Schmidt
What is Schema theory?
Slow movements: feedback-based
Fast movements: program-based
Schema: rule, concept, or relationship formed on the basis of experience
Initial conditions
Relationships between movement parameters
Environmental outcomes
Sensory consequences
Recall schema
used to select, define initial movement conditions
Recognition schema
used to evaluate movement responses based on expected sensory consequences/outcomes
Who is associated with the 3 stages of motor learning?
Fitts and Posner
What are the three stages?
Cognitive
Associative
Autonomous
Cognitive stage
finding appropriate strategy, overall understanding of skill, cognitive map, What to do
Associative Stage
refining a movement pattern, use of proprioceptive rather than visual cues; How to do
Autonomous Stage
skilled at movement, automatic, less attention needed for task, motor program runs itself, highly coordinated, focus on success, can perform equally well in closed skill or open skill; How to succeed
Who is associated with the Two-stage theory of motor acquisition?
Gentile
What is the Two-stage theory of motor acquisition?
1) getting the idea of the movement
2) fixation/diversification
What does “getting the idea of the movement” consist of?
Understanding goal of task
Develop appropriate movement strategies
Understanding the environmental features critical to the organization of movement
learn to distinguish constraining (regulatory) features of the environment from non-regulatory
What does “fixation/diversification” consist of?
refining movement patterns
developing the capability of adapting the movement to changing task and environmental demand
performing task efficiently, consistently from trial to trial.