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Limited information-processing capacity in vision explains number psychophysics
Samuel J Cheyette1, Shengyi Wu1, Steven T Piantadosi2
1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology.
Psychological Review
|April 22, 2024
Summary
Our sense of number emerges from the visual system
Area of Science:
- Cognitive psychology
- Visual perception
- Numerical cognition
Background:
- Humans and animals can perceive object quantities, crucial for mathematical development.
- The underlying perceptual mechanisms for numerical sense are not fully understood.
Purpose of the Study:
- To investigate the role of visual object location encoding in numerical perception.
- To determine if efficient location encoding explains key numerical psychophysics.
Main Methods:
- Developed a mathematical model of efficient, information-limited object location encoding.
- Conducted behavioral experiments measuring change-localization and number estimation.
- Analyzed individual differences in performance and model parameter fits.
Main Results:
- The location encoding model accurately predicts psychophysical phenomena like subitizing and Weber's law.
- Experimental data align with the model's predictions for both localization and estimation tasks.
- Individual differences in localization performance predict number estimation, suggesting shared perceptual constraints.
Conclusions:
- The visual sense of number is not based on a dedicated numerical module.
- Key features of numerical cognition arise as by-products of efficient, low-level visual perception.
- Perceptual limitations in encoding object locations fundamentally shape our numerical abilities.
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