Perceived group size is determined by the centroids of the component elements
Alexandria M Boswell1,2, Peter J Kohler3,4,5, J Daniel McCarthy6,7
1Department of Psychology, University of Nevada, Reno, Nevada, USA.
Journal of Vision
|December 1, 2021
Summary
The visual system estimates the size of grouped objects using the distance between component element centroids, not individual element size or outer contours. This finding highlights the role of centroids in visual perception.
Area of Science:
- Visual perception
- Cognitive neuroscience
- Computational vision
Background:
- Object size perception relies on retinal size, distance, and prior knowledge.
- Perceptually grouped objects pose challenges for size estimation due to lack of continuous contours.
Purpose of the Study:
- Investigate how the visual system estimates the size of perceptually grouped objects.
- Determine the cues used for judging the size of arrays of component elements.
Main Methods:
- Systematic variation of component element shape and orientation.
- Two-alternative forced-choice task to assess perceived size.
- Analysis of perceived size based on centroid distances from the array center.
Main Results:
- Perceived array size is accurately predicted by the distance between component element centroids and the array center.
- Perceived size is based on the average centroid distance when distances vary.
- Individual element size and smooth outer contours do not influence perceived size.
Conclusions:
- Visual system utilizes centroid information for estimating the size of grouped objects.
- Centroids play a crucial role in visual perception of ensembles.
- Findings have implications for understanding size estimation in complex visual scenes.
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