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Published on: March 21, 2019
Hand-head coordination changes from discrete to reciprocal hand movements for various difficulty settings
Mathieu Germain-Robitaille1, Romain Terrier, Nicolas Forestier
1Division de Kinésiologie, Département de Médecine Sociale et Préventive, Faculté de Médecine, Université Laval, Québec, Québec G1K 7P4, Canada.
Neuroscience Letters
|May 26, 2012
Summary
Hand-head coordination during visually guided movements is not fixed. It changes based on task type (discrete vs. reciprocal) and difficulty, indicating adaptation to specific movement demands.
Area of Science:
- Neuroscience
- Human Motor Control
- Biomechanics
Background:
- Understanding temporal hand-head coordination in visually guided movements is crucial for explaining motor control.
- Previous research has not fully elucidated the parameters influencing this coordination.
Purpose of the Study:
- To investigate how task nature (discrete vs. reciprocal) and task difficulty (index of difficulty) affect temporal hand-head coordination.
- To determine if hand-head coordination follows a fixed rule or adapts to task demands.
Main Methods:
- A Fitts' law-like paradigm was used with subjects performing discrete and reciprocal aiming movements.
- Task difficulty was varied (4.7, 5.7, and 6.7 bits).
- Temporal hand-head coordination was quantified using hand-head latencies at movement onset, peak speed, and offset.
Main Results:
- Head movements were unaffected by task difficulty during discrete movements.
- During reciprocal movements, head movements were shorter in duration and amplitude than discrete movements and increased with task difficulty.
- Positive offset latencies (hand movement completion after head movement cessation) were observed for all difficulties in reciprocal movements, but not discrete movements.
Conclusions:
- Hand-head coordination patterns differ significantly between discrete and reciprocal movements.
- Coordination also varies with task difficulty, suggesting it is adjusted based on specific task requirements rather than adhering to a rigid rule.
