Table 4.
Frontal Alpha Power Reliability for Lights-Off and Lights-On Conditions
| Lights – Off Condition | ||||||
|---|---|---|---|---|---|---|
| 8-Month | 12-Month | 18-Month | ||||
| Left | Right | Left | Right | Left | Right | |
| M Split-Half Correlation | 0.81 | 0.80 | 0.86 | 0.83 | 0.85 | 0.83 |
| Cronbach’s α | 0.87 | 0.90 | 0.92 | 0.89 | 0.92 | 0.90 |
| SD | 0.18 | 0.19 | 0.16 | 0.16 | 0.13 | 0.13 |
| Lights – On Condition | ||||||
| M Split-Half Correlation | 0.85 | 0.82 | 0.85 | 0.86 | 0.81 | 0.82 |
| Cronbach’s α | 0.91 | 0.89 | 0.91 | 0.92 | 0.90 | 0.90 |
| SD | 0.15 | 0.16 | 0.19 | 0.16 | 0.11 | 0.13 |
Notes: Split-half average correlations are based on 100 random splits within each subject’s segment-by-segment power data and averaged across the sample. Left and Right labels indicate brain hemispheres.