Table 2.
Fixed effects estimates from the linear mixed model predicting pupil size
| Predictor | Estimate (b) | Std. Error (SE) | df | t-value | p |
|---|---|---|---|---|---|
| Intercept (NS) | 47.96 | 1.91 | 449.10 | 25.14 | < 0.001 |
| Trial Number | −0.018 | 0.028 | 1687.30 | −0.64 | 0.524 |
| 12 Channels (12 C) * | 26.78 | 2.09 | 1686.57 | 12.79 | < 0.001 |
| 8 Channels (8 C) * | 51.55 | 2.09 | 1683.88 | 24.68 | < 0.001 |
| 6 Channels (6 C) * | 82.50 | 2.11 | 1689.09 | 39.16 | < 0.001 |
| 4 Channels (4 C) * | 87.36 | 2.09 | 1687.61 | 41.89 | < 0.001 |
| Random Effects | Variance | Std.Dev. (SD) | |||
| Participant (Intercept) | 4.52 | 2.13 | |||
| Residual | 734.56 | 27.10 | |||
| b unstandardized regression coefficient, SE standard error, df degrees of freedom. Number of observations = 1691. Grouping levels: Participant = 20. NS = Normal Speech | |||||
Annotation: * indicates that the effect of the variable is significant; a colon between the variables indicates the interaction