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An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles
Published on: August 25, 2020
Automatic adjustment of visuomotor readiness
1Department of Psychology, Harvard University, Cambridge, MA, USA. jhsong@ski.org
Journal of Vision
|January 26, 2008
Summary
Visuomotor readiness adjusts automatically based on recent task difficulty. This implicit learning, not explicit knowledge, influences movement initiation speed and accuracy, even when task types are predictable.
Area of Science:
- Cognitive Neuroscience
- Motor Control
- Human Movement Science
Background:
- Sensorimotor readiness differs between easy and difficult tasks.
- Task predictability influences motor preparation and execution.
Purpose of the Study:
- Investigate how visuomotor readiness is adjusted based on task difficulty.
- Differentiate between explicit knowledge and implicit learning in motor preparation.
Main Methods:
- Participants performed reaching movements to single or odd-color targets.
- Trial types were presented in separate blocks, mixed randomly, or predictably alternated.
- Movement initiation latencies and trajectory paths were analyzed.
Main Results:
- Separate blocks showed faster initiation for easy tasks; mixed blocks homogenized initiation times.
- Predictable alternation also led to homogenization, refuting explicit knowledge hypothesis.
- Faster initiation in difficult tasks correlated with curved trajectories, indicating initial error.
Conclusions:
- Visuomotor readiness is automatically adjusted by recent task difficulty, suggesting implicit learning.
- Recent experience, not explicit knowledge, drives these automatic adjustments in motor preparation.
