Speed and Accuracy Flashcards
Why study speed and accuracy?
- Many activities in life require us to move our limbs in a goal directed manner
- In many instances a tradeoff between speed and accuracy is needed
Relationship of error rate and speed
Linear
What happens to speed when approaching the target?
Movement slows
Components of Woodworth’s Model
- Initial impulse projecting the limb
- Visually driven “homing-in” phase
Fitts Law
The time required to rapidly move to a target area is a function of the ratio between the distance to the target (A) and the width of the target (W)
Index of Difficulty Equation
ID = Log2(2A/W)
Movement Time Equation
MT = a + b(ID)
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Goal-Directed Movement (Meyer et al. -1988)
- Pre-planned initial impulse
- Visual/proprioceptive driven corrective sub-movements
Goal-Directed Movement (Elliot- 2010)
Before
- Preprogramming of movement
During
- Comparison of the expected efferent/afferent command to actual performance
- Vision/proprioception driven corrective sub-movements
After
- Processing of feedback
- Refinement of strategy (internal efferent/afferent representation)
Types of Tasks
- Discrete
- Serial
Discrete Task
One movement, from the starting position to the target
Serial Task
Repetitive movement from one target to the other
Kinematic Measurements
The branch of mechanics concerned with the motion of objects without reference to the forces that cause the motion
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