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Group means for contingent negative variation (CNV) amplitudes by condition. Figure 6a presents the effects of magnitude (predictable small vs. predictable large). Figure 6b presents the effects of predictability (predictable vs. unpredictable-in-magnitude). There was a statistically significant condition main effect due to larger CNV amplitude in the unpredictable-in-magnitude compared to predictable trials. Error bars represent the standard error of the mean. PD = Parkinson’s disease
