| EMG | Electromyography |
| cEMG | corrugator supercilii electromyography |
| zEMG | zygomatic major electromyography |
| LSTM | Long short-term memory |
| ML | Machine learning |
| RF | Random forest |
| SHAP | SHapley Additive exPlanations |
| SD | Standard deviation |
| MSE | Mean squared error |
| ANOVA | Analysis of variance |