Table 1.

Outline of the applied stimulus conditions.

Condition	Frequency of probe	ISI	Distractor	Probability
1	25 Hz	2 s	no	combined: 75%
2	25 Hz	8 s	no
3	25 + f Hz	2 s	no
4	25 + f Hz	8 s	no
5	25 Hz	2 s	yes	combined: 25%
6	25 Hz	8 s	yes
7	25 + f Hz	2 s	yes
8	25 + f Hz	8 s	yes

Note: Stimulus conditions were applied in pseudo-randomised order. The frequencies of the cue and the distractor stimuli were always 25 Hz. Cue and probe stimuli were delivered to the right hand, distractor stimuli to the left hand. f denotes the minimal difference between cue and probe stimuli that could be detected with 80% accuracy.