4.1. Psychometric measurements
We should first point out that the psychometric task applied to Chinese
participants successfully yielded an easy and a difficult version,
markedly differing in the percentage of correct responses (95 vs. 74%
correct). Therefore, the test, albeit a single task in each version
fulfills the criterion of a speed test, where the variance is mainly in
RTs, and a difficult version, where individuals differ in the proportion
of correct responses. The relative independence of the speed and
accuracy tasks is reflected in their low correlation (r = 0.36).
Importantly, both task versions had shown sufficient to excellent
reliability.