Fig. 1

Time spent on the neuropsychological tests. Boxplots showing the time spent by the FHS participants on each neuropsychological test. For each test, the boxplots were generated on participants with normal cognition (NC), those with mild cognitive impairment (MCI), and those who had dementia (DE); those who were non-demented (NDE) combined the NC and MCI individuals. We also indicated the number of recordings that were processed to generate each boxplot. We also computed pairwise statistical significance between two groups (NC vs. MCI, MCI vs. DE, NC vs. DE, and DE vs. NDE). We evaluated the differences in means of the durations of all three cognitive statuses using a pairwise t-test. The symbol “*” indicates statistical significance at p < 0.05, the symbol “**” indicates statistical significance at p < 0.01, the symbol “***” indicates statistical significance at p < 0.001, and “n.s.” indicates p > 0.05. Logical Memory (LM) tests with a (†) symbol denote that an alternative story prompt was administered for the test. It is possible that one participant may receive a prompt under each of the LM recall conditions (one recording). Because many neuropsychological tests were administered on the participants, we chose a representation scheme that combined colors and hatches. The colored hatches were used to represent each individual neuropsychological test and this information was used to aid visualization in subsequent figures