Japanese readers show a crowding reduction even in vertically oriented strings of letters

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Visual crowding significantly impacts reading performance, with a weaker effect observed in letter reading compared to symbol recognition.
• Prior research indicated that extensive horizontal reading experience reduces crowding solely in horizontal text strings.
• The influence of reading experience on visual crowding, particularly across different text orientations, requires further investigation.

Purpose of the Study:

• To investigate how extensive experience with both vertical and horizontal text orientations affects letter identification performance in Japanese readers.
• To examine the impact of string orientation on visual crowding reduction.
• To determine the extent to which reading experience influences crowding reduction based on letter type and spatial processing zones.

Main Methods:

• Three experiments were conducted involving Japanese readers with extensive experience in both vertical and horizontal text.
• Letter identification performance was assessed across various string orientations (vertical, horizontal, diagonal).
• Crowding reduction was measured and analyzed in relation to text orientation, letter type (Japanese vs. alphabet), and the location of crowding zones.

Main Results:

• Japanese readers exhibited crowding reduction in vertical text strings, suggesting adaptive changes in visual processing.
• Crowding reduction was less robust for unfamiliar orientations like diagonal strings.
• Crowding reduction was less pronounced for Japanese letters compared to alphabet letters, indicating letter-type dependency.
• Crowding reduction was not robust in zones known for stronger crowding, even for alphabet letters.
• Reading experience appears to influence specific aspects of higher-level letter identification, particularly for alphabet recognition.

Conclusions:

• Extensive reading experience adaptively shapes the spatial properties of letter-specific detection units based on text orientation.
• The influence of reading experience on visual crowding is constrained by letter type and the specific visual processing regions involved.
• Reading experience modulates only certain components of letter identification, with a notable impact on alphabet recognition within higher-level processing stages.