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Target-flanker similarity effects reflect image segmentation not perceptual grouping
Cathleen M Moore1, Sihan He2, Qingzi Zheng2
1Department of Psychological and Brain Sciences, University of Iowa, G60 PBSB, Iowa City, IA, 52242, USA. cathleen-moore@uiowa.edu.
Attention, Perception & Psychophysics
|August 28, 2020
Summary
The flanker-congruence effect (FCE) is not solely due to grouping. Feature differences aid visual selection by improving image segmentation, not by obligatory grouping.
Area of Science:
- Cognitive Psychology
- Visual Perception
- Neuroscience
Background:
- The flanker-congruence effect (FCE) demonstrates how surrounding stimuli influence target identification.
- Previous research suggested FCE is linked to spatial selection precision and perceptual grouping.
Purpose of the Study:
- To differentiate between the group selection and image segmentation hypotheses of the FCE.
- To investigate the role of feature similarity versus grouping in FCE magnitude.
Main Methods:
- Experimental design manipulating target-flanker grouping while controlling for feature differences (color).
- Analysis of FCE magnitude under conditions of grouped and ungrouped targets and flankers.
Main Results:
- Same-colored flankers did not produce larger FCEs than different-colored flankers when feature differences were controlled.
- The FCE magnitude was not solely dependent on perceptual grouping.
Conclusions:
- Similarity effects on FCE are primarily driven by image segmentation, not obligatory selection of grouped items.
- Visual selection relies on feature differences to segment information, influencing the FCE.
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