The Influence of the Manner of Grasping a White Cane on the Ability of Visually Impaired People to Perceive the Texture of Objects
This study examined the relationship between a surface’s texture (i.e., the particle size) and the perception of its roughness obtained from a white cane. The perception of roughness was measured by a magnitude estimation method with nine visually impaired people who used white canes. Their audiovisual information was restricted with eye masks and earmuffs. The perceived texture was investigated with three different styles of grasping the white cane: the index finger grasp, pencil grasp, and thumb grasp. Participants estimated the roughness of 18 waterproof abrasive papers with different particle sizes (6.7 to 279 μm). Because the exponent for this relationship was almost 0.35 for all three grasping styles when the particle size was small, it can be concluded that a small increase in the particle size causes a significant increase in the perceived roughness.
KeywordsWhite cane Visually impaired people Texture Manner of grasping Magnitude estimation
This work was supported by the Japan Society for the Promotion of Science’s KAKENHI grant numbers JP16H03753, JP17K18457 and JP18K18698.
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