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Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes
Published on: January 19, 2024
The time course of direction specification in brief interceptive actions
Welber Marinovic1, Annaliese M Plooy, James R Tresilian
1Perception & Motor Systems Laboratory, School of Human Movement Studies, The University of Queensland, Brisbane, QLD, Australia. wmarinovic@hms.uq.edu.au
Experimental Psychology
|February 25, 2010
Summary
Athletes can adjust their movements based on target direction up to 250 ms before acting. This motor preparation occurs discretely, allowing for rapid adjustments in sports like baseball and tennis.
Area of Science:
- Cognitive Neuroscience
- Motor Control
- Sports Science
Background:
- Fastball sports demand rapid, accurate responses to brief visual information.
- Limited viewing time necessitates advance motor preparation for movement accuracy.
- Motor programs require specific target information, but the latest incorporation time is unknown.
Purpose of the Study:
- To determine the latest possible moment for incorporating target direction into a motor program.
- To investigate whether direction information is integrated discretely or continuously before movement onset.
Main Methods:
- Participants performed movements with a fixed duration (180 ms) towards targets.
- Movement onset (MO) was estimated, and preparation intervals varied.
- Directional cues were presented at different times before estimated MO to assess information incorporation.
Main Results:
- Directional information was fully incorporated into the motor program with preparation intervals as short as 250 ms.
- Movement direction was predominantly specified in a discrete manner, even with short preparation intervals.
- This suggests a rapid, discrete update mechanism for motor programming under time constraints.
Conclusions:
- Motor programs can be updated with critical directional information very close to movement onset.
- The discrete nature of this update facilitates efficient adaptation in time-critical tasks.
- Findings have implications for understanding human motor learning and performance in dynamic environments.
