Table 3. Correlations.

Correlations of classification accuracy between pupil diameter and EEG, pupil and EEG+pupil as well as EEG+pupil and EEG; The table is split by the training and test blocks experimental approach and the 10-fold cross-validation within block experimental approach.

	separate training/test blocks	cross-validation within block
pupil * EEG	-0.12 (p = .51)	0.13 (p = .49)
pupil * EEG+pupil	0.18 (p = .35)	0.33 (p = .08)
EEG * (EEG+pupil)	0.72 (p <.01)	0.78 (p <.01)