Pearson’s correlations were significantly negative in the rotation span ( r = −0.505, p = 0.004, R 2 = 0.255) as well as the reading span ( r = −0.409, p = 0.008, R 2 = 0.167), while the correlation only approached significance in the symmetry span ( r = −0.322, p = 0.084, R 2 = 0.104).
We take the finding that five out of the six correlations were significant or approaching significance as support of our conclusion from Experiment Series 1, i.e., that inter-individual differences in EF capabilities affect task processing before, at, and after the stage of the bottleneck, suggesting that EF are demanded at several stages during the processing of a dual-task.