Table 1.
Participant characteristics and EEG alpha power.
| Variable | n | % or M | SD | Range |
|---|---|---|---|---|
| Demographics | ||||
| Total sample | 81 | 100.0% | -- | -- |
| Sex (male) | 47 | 58% | -- | -- |
| Ethnicity (Hispanic/Latino) | 45 | 55.6% | -- | -- |
| Race (White) | 41 | 50.6% | -- | -- |
| Race (Black/African American) | 26 | 32.1% | -- | -- |
| Race (Native Hawaiian or Other Pacific Islander) | 1 | 1.2% | ||
| Race (Asian) | 4 | 4.9% | ||
| Race (American Indian or Alaska Native) | 2 | 2.5% | ||
| Parent education (≤ high school) | 26 | 32.1% | -- | -- |
| Parent education (some college) | 20 | 24.7% | -- | -- |
| Parent education (bachelor's degree) | 20 | 24.7% | -- | -- |
| Parent education (graduate degree) | 8 | 9.9% | -- | -- |
| Other | 6 | 7.4% | -- | -- |
| Participant characteristics | ||||
| Gestational age (weeks) | 81 | 30.36 | 4.78 | 23.00–36.00 |
| Chronological age (months) | 81 | 23.31 | 4.94 | 14.00–35.82 |
| Looking Proportion | 81 | 0.61 | 0.18 | 0.15–0.90 |
| EEG alpha power by region | ||||
| Frontal Alpha Power | 81 | -0.46 | 0.45 | -1.45–0.58 |
| Central Alpha Power | 81 | -0.54 | 0.53 | -1.76–0.74 |
| Parietal Alpha Power | 81 | -0.61 | 0.53 | -1.83–0.67 |
| Occipital Alpha Power | 81 | -0.50 | 0.52 | -1.63–0.74 |
| EEG alpha power by engagement condition | ||||
| Looking Alpha Power | 81 | -0.59 | 0.42 | -1.67 – 0.02 |
| Rest Alpha Power | 81 | -0.46 | 0.52 | -1.67– 0.68 |
| Number of Segments Per Condition (1 s) | ||||
| Looking | 81 | 218.8 | 46.9 | 88–405 |
| Rest | 81 | 192.8 | 14.8 | 180–271 |
Note. Descriptive statistics for participant characteristics, looking proportion, and EEG alpha power across regions and conditions.