Table 3.
Sensor modalities and derived indicators used in the wearable-based AR. Abbreviations: heart rate (HR), heart rate variability (HRV).
| Physiological Signal Type | Derived Indicators | |
|---|---|---|
| Head/Face | Electroencephalogram | Electric potential changes of brain neurons |
| Electromyogram | Facial muscle activity (e.g., zygomaticus major) | |
| Electrooculography | Eye movements | |
| Photoplethysmogram (ear) | HR and HRV | |
| Torso/Back | Electrocardiogram | HR and HRV |
| Electrodermal activity | Tonic and phasic component | |
| Electromyogram | Muscle activity | |
| Inertial sensor | Physical activity/body pose | |
| Respiratory inductive Plethys-mograph | Respiration rate and volume | |
| Body thermometer | Temperature | |
| Hand/Wrist | Electrodermal activity meter | Tonic and phasic component |
| Blood Oxymeter | Blood oxygen saturation | |
| Blood pressure | Sphygmomanometer | |
| Inertial sensor | Physical activity | |
| Photoplethysmogram | HR and HRV | |
| Thermometer | Temperature | |
| Feet/Ankle | Electrodermal activity | Tonic and phasic component |
| Inertial sensor | Physical activity | |
| Context | Sensors of a mobile phone (GPS, microphone, etc.) | Location, Sound, Activity, Interaction |