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The effect of temporal and force changes on the patterning of sequential movements
J P Piek1, D J Glencross, N C Barrett
1Research Centre for Applied Psychology, School of Psychology, Curtin University of Technology, Perth, Australia.
Psychological Research
|January 1, 1993
Summary
This study on motor control found that altering tap force impacts movement timing. Changes in contact interval timing are linked to mechanical force, while non-contact interval timing relates to organizational time.
Area of Science:
- Cognitive Psychology
- Motor Control
- Human Movement Science
Background:
- Understanding the programming of sequential actions is crucial for motor control research.
- Previous work linked timing changes in sequential movements to organizational time.
- The intertap interval was previously considered a monolithic unit.
Purpose of the Study:
- To investigate how variations in tap force affect the timing of sequential movements.
- To differentiate the contributions of contact and non-contact intervals to overall intertap timing.
- To examine the relationship between mechanical force changes and motor timing.
Main Methods:
- Participants performed a five-tap sequence with their right hand at varying rates (150, 200, 250 ms).
- Two conditions involved increasing or decreasing tap force at one position, then returning to baseline.
- The intertap interval was analyzed by separating it into contact and non-contact intervals.
Main Results:
- Changes in tap force significantly altered the timing of the contact interval.
- The non-contact interval timing was influenced by organizational time requirements.
- Mechanical aspects of force application directly impacted the contact interval duration.
Conclusions:
- The study successfully decomposed the intertap interval, revealing distinct timing mechanisms.
- Mechanical force changes are a primary determinant of contact interval timing.
- Organizational time remains a key factor for non-contact interval timing in sequential movements.