Table 4.
The features selected by the l1-regularized support vector machine under negative emotional stimulus.
| No. | Features | Rhythm | Brain region |
|---|---|---|---|
| 1 | Approximate entropy | High Beta | Left frontal lobe |
| 2 | Power spectral entropy | Theta | Left frontal lobe |
| 3 | Approximate entropy | Low Beta | Left frontal lobe |
| 4 | Sample entropy | Alpha | Temporal lobe |
| 5 | Lyapunov exponent | High Beta | Occipital lobe |
| 6 | Correlation dimension | Alpha | Occipital lobe |
| 7 | Peak–peak mean | Gamma | Occipital lobe |
| 8 | Mean square value | Gamma | Occipital lobe |
| 9 | Variance | Gamma | Occipital lobe |
| 10 | Maximum power spectral density | Gamma | Occipital lobe |
| 11 | Hjorth parameter: mobility | Alpha | Occipital lobe |
| 12 | Correlation dimension | Gamma | Occipital lobe |
| 13 | Hjorth parameter: mobility | Theta | Parietal lobe |
| 14 | Correlation dimension | Gamma | Parietal lobe |
| 15 | Correlation dimension | Gamma | Temporal lobe |
| 16 | Kolmogorov entropy | High Beta | Right frontal lobe |
| 17 | Power sum | Alpha | Right frontal lobe |
| 18 | Maximum power spectral frequency | Low Beta | Right frontal lobe |
| 19 | Sample entropy | High Beta | Right frontal lobe |
| 20 | Hjorth parameter: activity | High Beta | Right frontal lobe |
| 21 | Sample entropy | High Beta | Right frontal lobe |