Table 2.
Methodological Aspects per Included Study.
| Ref. | Device | Processing | Baseline | |||
|---|---|---|---|---|---|---|
| Filtering | Cleaning | Activity | Length | Usage | ||
| [52] | Shimmer3 GSR+ | - | Interpolation Normalization |
Video | 7 min | - |
| [53] | Empatica E4 | - | - | Learning session | - | Average in plots |
| [54] | Self-assembled | Low-pass filter | - | - | - | - |
| [55] | ProComp Infiniti | - | Manual and visual | Different tasks & video | 22 min | Calculate difference score |
| [39] | Empatica E3 | High and low-pass filter | - | - | - | - |
| [56] | Empatica E4 | - | Machine learning | - | - | - |
| [57] | MIT sensor | - | - | - | - | - |
| [58] | Electrodes Ag/AgCl filled | Low-pass filter & down-sampling | - | No specific activities | 5 min | Mean baseline as covariate |
| [49] | BioSemi Active 2 | Down-sampling | - | Resting time & practice video’s | 5 min | Segmenting signal |
| [59] | BodyMedia Core | Non-specified | Accelerometer | - | - | - |
| [60] | Not specified | - | - | - | - | - |
| [46] | Q-Sensor 2.0 | - | - | No specific activities | 10–15 min | Correction for normalization |
| [61] | Q-Sensor 2.0; Biopac | - | - | No specific activities | 2–5 min | Correction for normalization |
| [40] | Empatica E4 | - | - | Learning session | - | Used in analysis |
| [62] | Biopac | - | - | - | - | - |
| [63] | Biopac | High-pass | Normalization | - | - | - |
| [36] | Empatica E4 | - | Accelerometer L2 norm calculation |
- | - | - |
| [50] | BioNomadix | Non-specified | Non-specified | - | - | - |
| [64] | Empatica E3 | Adaptive Gaussian filter | Manual, visual Normalization | - | - | - |
| [65] | ProComp Infiniti | - | Normalization | Watching video & learning session | 4 min | Calculate difference score |
| [66] | Biosemi Active 2 | Down-sampling | - | No specific activities | - | Analysis |
| [33] | Empatica E4 | No processing | No processing | - | - | - |
| [67] | Empatica E4 | - | - | - | - | - |
| [68] | Empatica E4 | - | - | Breathing exercise | 5 min | Analysis |
| [69] | Biopac | Low-pass filter | - | Watching video | 30 s | Comparing to baseline |
| [70] | Empatica E3 | - | Normalization | No specific activities | - | - |
| [71] | Empatica E3 | - | Accelerometer Normalization |
- | - | - |
- means no information is given.