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Developmental improvements in the resolution and capacity of visual working memory share a common source
Vanessa R Simmering1, Hilary E Miller2
1Department of Psychology, McPherson Eye Research Institute, and Waisman Center, University of Wisconsin, 1202 W. Johnson St., Madison, WI, 53706, USA. simmering@wisc.edu.
Attention, Perception & Psychophysics
|June 23, 2016
Summary
This study shows that visual working memory (VWM) capacity and resolution improve together in children. Increased neural connectivity likely drives these developmental changes in VWM.
Area of Science:
- Cognitive Neuroscience
- Developmental Psychology
- Computational Neuroscience
Background:
- Visual working memory (VWM) representations are debated as either slot-like or a flexible resource pool.
- A dynamic neural field model offers an alternative, focusing on VWM processes (formation, maintenance, use).
- This model explains developmental VWM increases via strengthened neural connections.
Purpose of the Study:
- To test if VWM capacity and resolution correlate during childhood development.
- To support the dynamic neural field model's account of VWM development.
- To investigate the role of change detection in VWM improvements.
Main Methods:
- Compared 5- to 8-year-old children's performance on color discrimination and change detection tasks.
- Estimated VWM capacity and resolution from task performance.
- Analyzed the correlation between VWM capacity and resolution estimates.
Main Results:
- A significant positive correlation was found between VWM capacity and resolution in children.
- This finding supports the hypothesis that increasing neural connectivity underlies VWM development.
- Change detection accuracy was a critical component of VWM improvement.
Conclusions:
- VWM development in childhood is characterized by coordinated improvements in capacity and resolution.
- Strengthening neural connections, particularly for accurate comparisons, drives these improvements.
- Focusing on VWM processes, rather than just representational nature, is crucial for understanding development.
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