Table 3.
N400 Amplitude (SEM) negative microvolts for Pre-Adolescents, Adolescents, and Adults recorded at three midline electrodes. Measures pooled across Noun and Verb experiments. All mean amplitudes were significant at p < .0001 as compared to pre-stimulus baseline.
| All Groups | Pre-adolescent | Adolescent | Adult | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sound Type | OV | Fz | Cz | Pz | OV | Fz | Cz | Pz | OV | Fz | Cz | Pz | |
| Words | 6.13 (.29) | 6.88 (.29) | 6.91 (1.56) | 7.94 (1.61) | 8.70 (1.41) | 6.31 (.20) | 4.99 (.75) | 7.68 (1.32) | 9.06 (1.41) | 5.30 (.16) | 6.02 (.71) | 7.98 (.94) | 7.01 (.84) |
| Environme ntal Sounds | 7.26 (.13) | 8.30 (.26) | 9.00 (1.30) | 9.99 (1.04) | 10.31 (1.40) | 7.85 (.23) | 7.42 (1.09) | 9.86 (.97) | 10.26 (1.02) | 5.77 (.18) | 8.67 (.94) | 8.62 (.97) | 7.37 (.75) |
| Both Sou nd Types | 7.59 (.20) | 7.08 (.15) | 5.53 (.12) | ||||||||||
*
OV = Overall