Figure 4 Mean reaction time and accuracy in the 0-back, 1-back, and
2-back conditions.
3.3.2 Accuracy
The main effect of WM load was significant (F (2, 80) = 69.94,p < 0.001, ηp 2= 0.64). Accuracy in the 0-back tasks (0.96 ± 0.03) was significantly
higher than in the 1-back (0.93 ± 0.04) and 2-back tasks (0.88 ± 0.05),
and it was significantly higher in 1-back tasks than in 2-back tasks.
The main effect for group was not significant (F (1, 40) = 1.04,p = 0.31). The interaction of group and WM load was significant
(F (2, 80) = 3.15, p = 0.048,ηp 2 = 0.07). Further analysis
revealed that the stress group had a significantly higher accuracy (0.95
± 0.02) than the control group (0.92 ± 0.02) in the 1-back task
(p = 0.03, ηp 2 = 0.11).