This might be partially due to the BO-Condition showing large RT-differences between regular and deviant trials from Block 1 on [ F (1, 37) = 17.68, p < 0.001, η p 2 = 0.323] whereas the RO- Condition merely showed a trend of an increasing difference between regular and deviant trials, when comparing Block 1 with Block 6 [ F (1, 37) = 3.24, p = 0.080, η p 2 = 0.081].
However, there was a statistical trend in the Condition × Trial Type interaction with the BO-Condition showing a somewhat larger difference between regular and deviant trials than the RO-Condition, particularly in the last three training blocks.
This effect could not be attributed to specific differences between single blocks by post-hoc tests, though there seemed to be a numerical trend for participants making slightly more errors in the middle of the experiment (lowest mean error rate: Block 1 = 5.7%, highest mean error rate: Block 3 = 7.7%, Block 6 = 6.8%).