Effect of modulating braille dot height on reading regressions

Area of Science:

• Neuroscience
• Haptics
• Reading Science

Background:

• Reading involves regressions (movements against reading direction), studied in visual and braille reading.
• Visual reading regressions increase with reduced input clarity.
• It is unknown if tactile input clarity affects braille reading regressions.

Purpose of the Study:

• To investigate if reduced tactile braille dot height increases regressions.
• To determine the impact of braille dot height on reading speed.

Main Methods:

• Adult blind braille readers read standardized texts.
• Braille dot height was manipulated to high, medium, and low levels.
• Regressive finger movements and reading speed were measured.

Main Results:

• Low braille dot height significantly increased regressive finger movements.
• Reading speed significantly decreased at the lowest braille dot height.
• No significant effects were observed at medium or high braille dot heights.

Conclusions:

• Tactile perception near the threshold, similar to visual input, may elicit uncertainty and increase regressions.
• This threshold effect appears modality-independent in reading.
• The findings suggest a common neural basis for visual and tactile reading processes.