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Updated: Aug 12, 2026
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Training Synesthetic Letter-color Associations by Reading in Color
Published on: February 20, 2014
How crowding affects letter confusion
1The Arlene R. Gordon Research Institute, Lighthouse International, New York, New York 10022, USA. lliu@lighthouse.org
Summary
Narrow letter spacing increases random guessing and unique errors in visual perception. This impacts letter recognition, unlike wide spacing which shows fewer errors.
Area of Science:
- Visual perception
- Psychophysics
- Cognitive psychology
Background:
- Letter recognition acuity declines with reduced interletter spacing.
- Previous research indicates spacing impacts overall performance.
Purpose of the Study:
- To investigate how interletter spacing influences the types of errors in letter recognition.
- To compare error patterns under narrow versus wide spacing conditions.
Main Methods:
- Presentation of five-letter strings with varying interletter spacing (1.0 and 0.1 letter height).
- Construction of letter confusion matrices to analyze error patterns.
- Data collection from human subjects performing a letter recognition task.
Main Results:
- Distinct letter confusion matrices were observed for narrow and wide spacing.
- Narrow spacing resulted in more random confusions and unique errors not seen with wide spacing.
- Shared confusions were present across both spacing conditions.
Conclusions:
- Narrow spacing leads to increased random guessing and lateral interactions between letter features.
- These factors contribute significantly to the observed decline in acuity under narrow spacing.
- Error patterns provide insight into the mechanisms of visual crowding.
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