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The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task
Published on: May 3, 2018
Explicit information interferes with implicit motor learning of both continuous and discrete movement tasks after
1Department of Physical Therapy and Rehabilitation Sciences, University of Kansas Medical Center, Kansas City, KS, USA. lboyd@kumc.edu
Journal of Neurologic Physical Therapy : JNPT
|June 27, 2006
Summary
Explicit instructions can hinder motor learning after stroke, regardless of lesion location or task type. Allowing individuals to discover solutions through practice alone may be more beneficial for motor rehabilitation post-stroke.
Area of Science:
- Neuroscience
- Motor Rehabilitation
- Cognitive Psychology
Background:
- Implicit motor learning is crucial for stroke rehabilitation.
- Limited research exists on the interaction between explicit information and implicit learning in stroke survivors.
- Previous studies indicated explicit instructions disrupt implicit motor learning in specific stroke-related brain areas.
Purpose of the Study:
- To determine the robustness of findings that explicit information disrupts implicit motor learning after stroke.
- To investigate this disruption across discrete and continuous motor tasks.
- To assess the impact of explicit information on motor learning in individuals with sensorimotor cortical (SMC) or basal ganglia (BG) strokes compared to healthy controls (HC).
Main Methods:
- Ten individuals with SMC stroke, 10 with BG stroke, and 10 healthy controls participated.
- Participants practiced a discrete (serial reaction time task) and a continuous (continuous tracking task) motor task for 3 days.
- Participants were randomly assigned to either an explicit information (EI) or no explicit information (No-EI) group.
- Retention tests were conducted on a fourth day.
Main Results:
- Both stroke groups (SMC and BG) showed a negative response to explicit information, demonstrating an interference effect.
- Healthy controls did not exhibit this interference effect.
- The interference effect of explicit information was consistent across both discrete and continuous motor tasks.
Conclusions:
- Explicit information consistently interferes with implicit motor learning in individuals with stroke, irrespective of lesion location or task type.
- These findings suggest that relying solely on practice for motor task discovery may be more effective for stroke rehabilitation than providing explicit instructions.
- Rehabilitation scientists should consider the potential detrimental effects of certain explicit instructions during therapeutic tasks for stroke survivors.
