Fig. 2
From: The effects of dopamine on digit span in Parkinson’s disease
The effect of dopaminergic medication on performance on Digit Span Backward and Forward. There was no significant effect of dopaminergic medications on Digit Span Forward (a). However, a significant effect of medications was detected in Digit Span Backward. The Combined PD group (PD-MCI and PD no-MCI) performed significantly better ON medications than OFF medications (b). Error bars represent the Standard Error of the mean. PD = Parkinson’s disease; PDD = PD with dementia; PD-MCI = PD with Mild Cognitive Impairment; PD no-MCI = PD with no cognitive impairment. * = p < .05