Table 2. Mean values of subjects’ behavioral performance (mean percent correct hit rates and reaction times in ms, SD in brackets) in three visual WM conditions.

	Hit rates		Reaction times
WM-condition	EEGfMRI	EEG-only	EEGfMRI	EEG-only
0-back	99.24 (1.70)	99.43 (1.28)	391.38 (33.25)	439.56 (41.82)
1-back	97.33 (3.96)	98.29 (2.55)	429.13 (58.33)	437.57 (77.43)
2-back	92.00 (7.26)	91.43 (2.71)	445.38 (42.48)	464.43 (25.06)

‘EEGfMRI’ refers to the participants measured with simultaneous EEG-fMRI (n = 15), ‘outside’ refers to controls measured outside the scanner. Due to recording problems, behavioral data were unavailable for three outside participants which decreased the sample size to n = 5.