Coordination And Variability

Question 1

What is variability

Answer 1

Every time we replicate the same movement, a certain amount of change may be recorded between its subsequent repetitions

Question 2

What are the two types of variability

Answer 2

Increasing degrees of freedom

Kinematic movement variations

Question 3

Explain the two types of variability

Answer 3

Increasing degrees of freedom
-novice use less
- elite use more = variability

Kinematic movement variations
- for a given movement, how variable is the pattern

• noise from the motor system
• feedback corrections
• planning errors

Question 4

Explain abundance, redundancy and covariation

Answer 4

Can get same result multiple different ways

There are more moving parts than we need to carry out task

Covariation=
This is not random, relationships
= compensatory actions

Question 5

Explain outcome/execution variability

Answer 5

Variability in result - may be low

Execution variability- how the result is achieved. May be higher
Due to compensatory actions, feedback ect

Not all execution error can be noise or detrimental,
As outcome variability can still be low with high execution variability

Question 6

Explain perspectives on movement variability

Answer 6

Traditional - variation is noise, unwanted

Dynamical systems - variation has a functional role (humans are dynamical systems)

Not all variation is good, nor is all bad
Rather must look at its effect

Question 7

Explain the relationship between variability and expertise

Answer 7

Early stages - high movement and outcome variability
(Errors)

Intermediate - less variable, more successful pattern + try to recreate

Expert - may see an increase or decrease in

Question 8

Explain mechanically important phases

Answer 8

Lower variability at mechanically important phases

Higher when making feedback control adjustments

Question 9

Why may variation increase in elite performers

Answer 9

Get better at making corrections