Principles of Motor Control and Movement Accuracy

1
Chapter 6

• Principles of Motor Control and Movement Accuracy

2
Invariant Features

• Also known as deep structure
• Relative timing and relative force
• Relative timing the temporal structure of a
  movement, the duration of the sub-segments
  compared to the whole

3
Relative Timing

• See figure 6.1 on page 150
• Look at relative timing of walking and running on
  page 151

4
Phonograph example

• Page 153
• Identify invariant characteristics
• Relative timing and force
• Identify parameters (surface features)
• Absolute timing and force
• Identify executive and effectors

5
Speed-accuracy trade off

• Fitts Law
• Activity example
• Movement time is linearly related to index of
  difficulty
• Open-loop or closed-loop control?
• Sources of error? page 159
• Violations of the Fitts Law
• Timing errors
• Maximum force