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Reading speed benefits from increased vertical word spacing in normal peripheral vision
1College of Optometry, University of Houston, 505 J. Davis Armistead Building, Houston, TX 77204-2020, USA. schung@optometry.uh.edu
Summary
Increased vertical word spacing improves reading speed, especially in peripheral vision. This finding suggests that adjusting line spacing can mitigate crowding effects and enhance reading performance for individuals with visual field challenges.
Area of Science:
- Vision Science
- Reading Neuroscience
Background:
- Crowding, the visual phenomenon of impaired recognition due to nearby clutter, is a proposed cause of reduced reading speed in peripheral vision.
- Understanding crowding's impact on reading is crucial for visual performance research.
Purpose of the Study:
- To demonstrate the existence of crowding at the word level.
- To investigate if increased vertical word spacing enhances reading speed in both central and peripheral vision.
Main Methods:
- Participants read words presented via rapid serial visual presentation (RSVP) at varying critical print sizes and vertical spacings.
- Reading speed was measured at the fovea and 5-10 degrees in the inferior visual field.
- Vertical word spacing was manipulated from 0.8x to 2x standard single-spacing.
Main Results:
- Reading speed increased with vertical spacing up to 1.2x-1.5x at the fovea, then plateaued.
- Peripheral reading speed also improved with spacing but remained below unflanked speeds.
- Even at 2x spacing, peripheral reading speed was 25% slower than unflanked reading.
Conclusions:
- Increased vertical word spacing benefits reading speed by reducing crowding.
- The positive effect of vertical spacing on reading speed is more pronounced in peripheral vision compared to central vision.