2013/09/12 by Lisa Skedung, Martin Arvidsson, Jun Young Chung +3 · 2 citations
Computer Science · Engineering · Neuroscience · #Advanced Sensor and Energy Harvesting Materials #Interactive and Immersive Displays #Tactile and Sensory Interactions
paper · pdf · doi:10.1038/srep02617
openalex publication_date 2013/09/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
The human finger is exquisitely sensitive in perceiving different materials, but the question remains as to what length scales are capable of being distinguished in active touch. We combine material science with psychophysics to manufacture and haptically explore a series of topographically patterned surfaces of controlled wavelength, but identical chemistry. Strain-induced surface wrinkling and subsequent templating produced 16 surfaces with wrinkle wavelengths ranging from 300 nm to 90 μm and amplitudes between 7 nm and 4.5 μm. Perceived similarities of these surfaces (and two blanks) were pairwise scaled by participants, and interdistances among all stimuli were determined by individual differences scaling (INDSCAL). The tactile space thus generated and its two perceptual dimensions were directly linked to surface physical properties - the finger friction coefficient and the wrinkle wavelength. Finally, the lowest amplitude of the wrinkles so distinguished was approximately 10 nm, demonstrating that human tactile discrimination extends to the nanoscale.