Tappigraphy

We compared two standard methods used to estimate sleep with that of a new tappigraphy-based algorithm based on the gaps in smartphone usage. Pooling all of the measurements together (by concatenating the sleep-related estimates obtained from each participant), we found strong correlations between the putative sleep times determined by actigraphy versus tappigraphy

Tappigraphy has also uncovered associations between sleep patterns and mental health.

This year Ghosh published a small clinical study of people with epilepsy that shows how subtle changes in smartphone tappigraphy alone could be used to infer abnormalities in their brainwaves.