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Mean number of digits cancelled in 60 seconds in the three conditions. Error bars show standard deviations. PMC = Proximal Match Condition, in which stimuli were presented at the critical contrast measured for each individual to yield 80% accuracy for a briefly presented digit. OC-AD = Older control adults, matched to those with Alzheimer’s disease; OC-PD = Older control adults, matched to those with Parkinson’s disease.
