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Cognitive compliance
| Types | Indirect mode | Specific mode |
|---|---|---|
| subjective measure | Subjective assessment scale | NASA-TLX, WP scales, etc |
| Task performance | Dual task measurement | |
| objective measurement | Physiological measurement data | Electrocardiogram, oculomotor, electroencephalogram, etc |
Time domain indicators
| Name | unit | illustrate | Formula |
|---|---|---|---|
| MEAN | ms | Mean RR interval | |
| SDNN | ms | Normal RR interval standard deviation | |
rMSD D | ms | Root mean square of RR interval difference between neighbors | |
| pNN50 | % | proportion of RR interval difference greater than 50ms |
Meaning of each frequency
| Name | Abbreviation | Meaning | Frequency range |
|---|---|---|---|
| Very low frequency | VLF | - | <0.04 Hz |
| low frequency | LF | Reflecting sympatheti c nervous activity | 0.04 ~ 0.15 Hz |
| High frequency | HF | Reflecting parasympat hetic nerve activity | 0.15 ~ 0.4 Hz |
Technical parameters of signal acquisition equipment
| Name | Value range |
|---|---|
| resolution ratio ECG | ≥ 16Bit |
| measurement range | -1500 μV ~ 1500 μV |
| Adjustable magnification | 1,2,3,4,5,6,7 |
| accuracy | 0.183 μV, 0.0915 μV, 0.061 μV , 0.046 μV, 0.037μV , 0.026 μV |
| Number of wireless sensor channels | ≥1 |
| Wireless transmission frequency | 2.4GHz |
| Distance | 10m ~ 100m |
| Battery operating time | ≥ 4h |