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Number of articles using each sensing modality as a single data source and in combination with other sensors.
| Sensing Modality | As Single Source | In Combination |
|---|---|---|
| EEG | 19 | 4 |
| ECG | 10 | 8 |
| EMG | 0 | 2 |
| EOG | 0 | 1 |
| Accelerometer | 15 | 21 |
| RIP | 1 | 3 |
| Radar sensors | 4 | 0 |
| Pressure sensors | 4 | 0 |
| Audio | 2 | 1 |
| PPG | 4 | 16 |
| Nasal airflow | 1 | 1 |
| Sonar sensors | 1 | 0 |
| EDA | 1 | 0 |
