Fig. 3
From: The effects of dopamine on digit span in Parkinson’s disease
Dopaminergic effect is dependent on baseline WM. We determined the interaction between baseline WM and dopamine using Digit Span. No significant effect of dopamine was detected in the Digit Span Forward in either the Low or High baseline WM groups (a). However, in Digit Span Backward, the Low baseline WM group significantly improved ON medications. The High baseline WM Group was unaffected (b). Error bars represent the Standard Error of the mean. PD = Parkinson’s disease; PD-MCI = PD with mild cognitive impairment; PD no-MCI = PD with no cognitive impairment; WM = working memory. * = p < .05