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. 2013 Feb 13;8(2):e53053. doi: 10.1371/journal.pone.0053053

Figure 2. ERPs time locked to the instruction cue.

Figure 2

A. Averaged CNV amplitude in electrode Cz for the four main conditions, time locked to the appearance of the instruction cue (time 0 corresponds to the onset of the instruction cue). Note the difference in CNV amplitude between two free-choice rapid and delayed trials (solid lines), but no difference in CNV amplitude between instructed choice rapid and delayed trials (dashed lines). Asterisks indicate a significant ANOVA interaction (F test, p<0.05, uncorrected). Vertical dashed line at −700 ms indicates onset of warning signal and the end of baseline period (−850 to −700 ms). B. mean CNV amplitudes for the time window between −150 and 0 ms electrode Cz. Asterisk shows a significant difference (t-test, p<0.05, two tails, uncorrected).