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Visual working memory for simple and complex visual stimuli
Hing Yee Eng1, Diyu Chen, Yuhong Jiang
1Harvard University, Cambridge, Massachusetts, USA. heng@fas.harvard.edu
Psychonomic Bulletin & Review
|April 18, 2006
Summary
Visual working memory (VWM) capacity is not fixed at four items. VWM capacity decreases with object complexity, but this effect lessens with longer viewing times, indicating complexity is a factor, not a determinant.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Perception
Background:
- The 'magical number four' has been proposed as a limit for visual working memory (VWM) capacity.
- However, the influence of object perceptual complexity on VWM capacity remains debated.
Purpose of the Study:
- To investigate whether VWM capacity is constant across different object complexities.
- To determine the extent to which perceptual complexity affects VWM capacity.
Main Methods:
- Utilized a change detection task to assess VWM capacity.
- Employed six stimulus types varying in perceptual complexity: colors, letters, polygons, squiggles, cubes, and faces.
- Manipulated viewing time of the sample memory display.
Main Results:
- VWM capacity estimates decreased as stimulus perceptual complexity increased.
- The correlation between perceptual complexity and VWM capacity was significantly reduced with extended viewing durations.
- Perceptual complexity influenced, but did not solely determine, VWM capacity.
Conclusions:
- Visual working memory capacity is modulated by the perceptual complexity of to-be-remembered objects.
- Encoding limitations play a crucial role in the observed relationship between complexity and VWM capacity.
- Perceptual complexity is a significant, but not absolute, determinant of VWM capacity.