Table 4. Summary table of the Bayesian regression model results on the influence of anatomical thalamic measures on the three different measures of alpha power (total, relative and aperiodic-adjusted) and on aperiodic signal components.
Outcome | βpredictor [CI] | |||||
---|---|---|---|---|---|---|
Left thalamic radiation | Right thalamic radiation | Thalamus volume | Total intracranial volume | Age | Gender | |
Total individualized alpha power | 0.06 [–0.02 0.14] | 0.07 [–0.01 0.15] | 0.03 [–0.23 0.29] | –0.01 [–0.14 0.13] | –0.23 [–0.31 –0.15] | –0.35 [–0.43 –0.27] |
Aperiodic-adjusted individualized alpha power | 0.15 [0.07 0.23] | 0.15 [0.07 0.23] | 0.07 [–0.19 0.33] | –0.04 [–0.18 0.10] | 0.22 [0.14 0.30] | –0.39 [–0.47 –0.31] |
Relative alpha power | 0.11 [0.04 0.20] | 0.14 [ 0.06 0.22] | 0.00 [–0.27 0.27] | –0.01 [–0.15 0.13] | 0.14 [0.07 0.22] | –0.35 [–0.43 –0.27] |
Aperiodic intercept | 0.04 [–0.04 0.10] | 0.02 [–0.05 0.09] | –0.01 [–0.24 0.23] | 0.03 [–0.09 0.15] | –0.51 [–0.58 –0.44] | –0.35 [–0.42 –0.28] |
Aperiodic slope | 0.07 [0.00 0.14] | 0.03 [ –0.03 0.11] | –0.11 [–0.34 0.13] | –0.03 [–0.13 0.17] | –0.48 [–0.55 –0.41] | –0.39 [–0.45 –0.31] |
Note: CI = 98.52% Credible interval, gender variable is dummy coded: 1=female, 0=male. Credible intervals and β estimates of the covariates (total intracranial volume, age, and gender) showed minor deviations across the three models (see 4.4.3, models 4, 5 & 6), due to non-deterministic sampling in the Bayesian model estimation. Therefore, here they were averaged across the three models.