It has been brought to our attention that Figure 7 in our recently published paper  contains a labeling error. The group marked "slow" should be labeled "fast" and the group marked "fast" should be labeled "slow". The corrected figure 7 is given here as Figure 1.
Alzheimer's Disease and Memory Disorders Center, Baylor College of Medicine, Houston, USA
Division of Family Medicine, Baylor College of Medicine, Houston, USA
Department of Psychology, University of Houston, Houston, USA
Department of Epidemiology and Biostatistics, University of Texas Health Sciences Center, San Antonio, USA