Table 1.
Results of ANCOVA of early somatosensory ERP components in response to deviant and standard stimuli in younger and older adult groups.
| Mean amplitude (µV) ± SD | Mean difference | Age group main effect | Age group effect with stimulus intensities as covariates | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Young | Older | Mean [SEM] | F (df, error df) | p | η p 2 | F (df, error df) | p | η p 2 | |
| P50 | |||||||||
| std | 0.58 ± 0.45 | 0.83 ± 0.60 | 0.23 [0.10] | 4.57 (1,117) | 0.035* | 0.038 | 0.03 (1,115) | 0.863 | <0.001 |
| dev | 0.82 ± 0.51 | 1.24 ± 0. 75 | 0.42 [0.12] | 9.55 (1,117) | 0.002** | 0.075 | 0.30 (1,115) | 0.592 | 0.003 |
| N80 | |||||||||
| std | 0.06 ± 0.41 | 0.42 ± 0.48 | 0.37 [0.08] | 16.77 (1,117) | <0.001*** | 0.125 | 3.26 (1,115) | 0.074 | 0.028 |
| dev | 0.30 ± 0.70 | 0.62 ± 0.61 | 0.32 [0.13] | 6.56 (1,117) | 0.012* | 0.053 | 0.88 (1,115) | 0.350 | 0.008 |
Stimulus intensities for little finger and forefinger were used as covariates. SEM, standard error of mean; SD, standard deviation; df, degrees of freedom; η p 2, partial eta squared; p, statistical significance; *p < 0.05; **p < 0.01; ***p < 0.001.