While the direction of the correlation between λ RT and λ Acc was negative, as expected from a speed-accuracy trade-off, it did not reach statistical significance (Spearman's r = −0.18, p = 0.18).
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Dynamic sensorimotor planning during long-term sequence learning: the role of variability, response chunking and planning errors.
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The sentences
An inspection of the single-subject learning rates for both response time and accuracy ( Figure 2d ) reveals both highly significant learning at the group level and substantial inter-subject variability (λ RT = 0.357 +/-0.167, λ Acc = 3.46+/-2.22; mean +/- standard deviation).