Figure 2.
Forward digit memory span (DMS) and letter memory span (LMS). (a) DMS mean (with standard deviation): 4.0 (0.5) in controls and 4.7 (0.5) in the AMC group; LMS mean (with standard deviation): 7.4 (1.3) in the control group and 9.0 (1.1) in the AMC group. Both DMS and LMS were found significantly higher in the AMC group than in the controls [for DMS: t (48) = 5.4, P = 0.00, and for LMS: t (48) = 4.7, P = 0.00]. (b) Significant positive correlation between DMS and LMS was found across all subjects (r = 0.53, P = 0.00). [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]