Table 6. Results of Regressions Predicting Children's Memory from Their Age, Income, and General Sympathetic and Parasympathetic Reactivity.
Memory Performance | ||||
---|---|---|---|---|
Free Recall | Total Memory | |||
Model 1 β | Model 2 β | Model 1 β | Model 2 β | |
Predictors | ||||
Age | .45*** | .43*** | .58*** | .56*** |
Family income | .16 | .17 | .23** | .25** |
PEP reactivity index | .24** | .25** | .13 | .14 |
RSA reactivity index | −.03 | −.03 | −.11 | −.07 |
Age × PEP Reactivity Index | — | −.04 | — | −.09 |
Age × RSA reactivity index | — | .07 | — | .17* |
p < .05.
p < .01.
p < .001.
Note: Family income was scored on an ordinal scale, with 1 = <$10000 and 8 = >$60000. PEP, pre-ejection period and RSA, respiratory sinus arrhythmia. Higher PEP and RSA reactivity indices correspond to greater reactivity or consistent arousal throughout the laboratory protocol.