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Action plans can interact to hinder or facilitate reach performance
Lisa R Fournier1, Matthew D Wiediger2, Ezana F Taddese3
1Washington State University, Pullman, WA, USA. lfournier@wsu.edu.
Attention, Perception & Psychophysics
|July 12, 2015
Summary
Automatic reach responses show a benefit, not a delay, when action plans partly overlap in working memory (WM). This partial repetition benefit occurs for spatially compatible reaches, suggesting automaticity enhances performance.
Area of Science:
- Cognitive Neuroscience
- Motor Control
- Human Psychology
Background:
- Action planning and execution involve working memory (WM).
- Partially overlapping action plans can cause delays (costs) in controlled responses.
- The effect of overlapping plans on automatic responses is less understood.
Purpose of the Study:
- Investigate if automatic reach responses benefit from, rather than are delayed by, partially overlapping action plans in WM.
- Examine the influence of hemisphere and limb preference on reach performance with overlapping action plans.
Main Methods:
- Participants (left- and right-handers) performed reach tasks with ipsilateral hands.
- Action plans in WM involved either the same or a different hand.
- Stimulus locations varied in proximity to the body midline.
Main Results:
- A partial repetition benefit was observed for spatially compatible reaches far from the body midline.
- No partial repetition cost was found across any stimulus-reach locations.
- Automatic reach responses showed facilitation, not delay, with partially overlapping action plans.
Conclusions:
- Automatic reach responses are facilitated, not hindered, by partially overlapping action plans in working memory.
- The degree of feature overlap and spatial compatibility significantly impact partial repetition benefits.
- Hemispheric control and limb preference play roles in action control during reach tasks.
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