Table 2.
Mean Amplitudes of Nc and P400 Components for Each Age Group at Midline, Right, and Left Electrode Sites for the Face-Recognition Study
| Component | Age Range (mo) | Mother Mean (SD) | Stranger Mean (SD) | p |
|---|---|---|---|---|
| Nc | ||||
| Midline | 18–24 (12) | −12.45 (7.08) | −14.13 (5.81) | n.s. |
| Right | −10.71 (8.52) | −11.14 (7.22) | n.s. | |
| Left | −16.41 (6.21) | −12.33 (4.67) | .06 | |
| P400 | ||||
| Midline | 23.87 (11.63) | 20.09 (7.90) | n.s. | |
| Right | 23.12 (12.33) | 21.38 (6.87) | n.s. | |
| Left | 20.26 (12.06) | 17.35 (11.14) | n.s. | |
| Nc | ||||
| Midline | 24–45 (18) | −7.95 (4.01) | −8.03 (3.87) | n.s. |
| Right | −6.69 (3.64) | −5.94 (3.98) | n.s. | |
| Left | −10.32 (5.60) | −11.28 (5.99) | n.s. | |
| P400 | ||||
| Midline | 13.87 (6.12) | 13.23 (6.30) | n.s. | |
| Right | 14.57 (7.95) | 14.20 (8.31) | n.s. | |
| Left | 12.28 (7.94) | 13.16 (7.76) | n.s. | |
| Nc | ||||
| Midline | 45–56 (12) | 15.45 (6.45) | 19.50 (6.73) | .06 |
| Right | −6.61 (4.98) | −11.01 (2.82) | <.05 | |
| Left | −8.33 (4.57) | −10.58 (4.60) | <.05 | |
| P400 | ||||
| Midline | 15.45 (6.45) | 19.50 (6.73) | .06 | |
| Right | 13.36 (6.46) | 16.49 (5.53) | n.s. (.06) | |
| Left | 13.43 (7.50) | 16.95 (6.68) | n.s. (.06) | |