  Smartphone-based measurement platforms can collect data on human sensory
function in an accessible manner. We developed a smartphone app that measures
vibration perception thresholds by commanding vibrations with varying
amplitudes and recording user responses via (1) a staircase method that adjusts
a variable stimulus, and (2) a decay method that measures the time a user feels
a decaying stimulus. We conducted two studies with healthy adults to assess the
reliability and usability of the app when the smartphone was applied to the
hand and foot. The staircase mode had good reliability for repeated
measurements, both with and without the support of an in-person experimenter.
The app has the potential to be used at home in unguided scenarios.
