Table 1: Linear mixed model fit to paired associate learning scores with the correlation of the row vectors in of the paired words as predictor. Treatment coding was used for factors. For the youngest age group, is not predictive, but all other age groups show increasingly large slopes compared to the slope of the youngest age group. The range of is ; hence larger values for the coefficients of and its interactions imply worse performance on the PAL task.

A. parametric coefficients Estimate Std. Error t-value p-value

intercept 3.6220 0.6822 5.3096 0.0001
0.3058 0.1672 1.8293 0.0691
age=39 0.2297 0.1869 1.2292 0.2207
age=49 0.4665 0.1869 2.4964 0.0135
age=59 0.6078 0.1869 3.2528 0.0014
age=69 0.8029 0.1869 4.2970 0.0001
sex=male -0.1074 0.0230 -4.6638 0.0001
:age=39 0.1167 0.0458 2.5490 0.0117
:age=49 0.2090 0.0458 4.5640 0.0001
:age=59 0.2463 0.0458 5.3787 0.0001
:age=69 0.3239 0.0458 7.0735 0.0001

B. smooth terms edf Ref.df F-value p-value

random intercepts word pair 17.8607 18.0000 128.2283 0.0001