Study: NCT06237829

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Single bump acuity
Description: Investigators will design bumps of varying heights, spacings, diameters, and bump shapes (rounded top, flat top, angled top) which give a precise amount of mechanical stimulus to the finger. Subjects will be asked if they could notice a bump on the surface and instructed to make the judgment quickly (\<2 seconds). A psychometric curve, with a standard braille bump serving as the positive, \~100% success rate control, will be constructed

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Single bump acuity
Description: Investigators will design bumps of varying heights, spacings, diameters, and bump shapes (rounded top, flat top, angled top) which give a precise amount of mechanical stimulus to the finger. Subjects will be asked if they could notice a bump on the surface and instructed to make the judgment quickly (\<2 seconds). A psychometric curve, with a standard braille bump serving as the positive, \~100% success rate control, will be constructed

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Single bump acuity
Description: Investigators will design bumps of varying heights, spacings, diameters, and bump shapes (rounded top, flat top, angled top) which give a precise amount of mechanical stimulus to the finger. Subjects will be asked if they could notice a bump on the surface and instructed to make the judgment quickly (\<2 seconds). A psychometric curve, with a standard braille bump serving as the positive, \~100% success rate control, will be constructed

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Optimal spacing between bumps
Description: Investigators will fabricate and characterize two bumps of varying widths (ranging from 150 μm to 3 times the bump width, based on fabrication resolution available in commercial tactile aid machines). Subjects will be asked to run their finger across the two bumps (two bumps always form a line, so investigators do not need to ask subjects to orient their fingers) quickly and asked if they felt one bump or two.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Optimal spacing between bumps
Description: Investigators will fabricate and characterize two bumps of varying widths (ranging from 150 μm to 3 times the bump width, based on fabrication resolution available in commercial tactile aid machines). Subjects will be asked to run their finger across the two bumps (two bumps always form a line, so investigators do not need to ask subjects to orient their fingers) quickly and asked if they felt one bump or two.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Optimal spacing between bumps
Description: Investigators will fabricate and characterize two bumps of varying widths (ranging from 150 μm to 3 times the bump width, based on fabrication resolution available in commercial tactile aid machines). Subjects will be asked to run their finger across the two bumps (two bumps always form a line, so investigators do not need to ask subjects to orient their fingers) quickly and asked if they felt one bump or two.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Improving signal from a single bump with designer materials
Description: Investigators will coat single bumps with our designer materials (with alkyl and amino functional groups) to improve the mechanical stimuli from a single bump. Subjects will then be asked to perform a similar experiment as the single bump acuity test and the optimal spacing between bumps test. (can you notice the bump? or did you feel one or two bumps).

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Improving signal from a single bump with designer materials
Description: Investigators will coat single bumps with our designer materials (with alkyl and amino functional groups) to improve the mechanical stimuli from a single bump. Subjects will then be asked to perform a similar experiment as the single bump acuity test and the optimal spacing between bumps test. (can you notice the bump? or did you feel one or two bumps).

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Improving signal from a single bump with designer materials
Description: Investigators will coat single bumps with our designer materials (with alkyl and amino functional groups) to improve the mechanical stimuli from a single bump. Subjects will then be asked to perform a similar experiment as the single bump acuity test and the optimal spacing between bumps test. (can you notice the bump? or did you feel one or two bumps).