A Review of Wrist-Worn Wearable: Sensors, Models, and Challenges

Table 5

Signals used for affective recognition.

Measurements	Affect studies
Body movement	[4, 5]
Prior physical activity (steps and workouts)	[63]
Electrodermal activity (EDA) = galvanic skin response (GSR) = skin conductivity (SC)	[5, 16, 73–75]
Electrocardiogram (ECG)	[76–78]
Body/skin temperature	[5, 16, 79]
Heart rate (HR)	[5, 16, 63, 77, 79–81]
Heart rate variability (HRV)	[5]
Pulse	[74]
Respiration (RSP)	[5, 75, 82]
Electromyogram (EMG)	[75, 78]
Electroencephalogram (EEG)	[74, 76, 81]
Electrooculogram (EOG), magnetoencephalography (MEG), and near-infrared facial videos	[78]
Photoplethysmogram (PPG)	[73]
Self-reports	[74, 78, 81, 83, 84]
Location	[63, 74, 83] [78]
Time	[83] [78]
Call	[78]
SMS	[78]
Semantic description	[78]
Ambient temperature, atmospheric pressure, humidity, light, posture, social interaction, and type of interaction	[5]